The Experts below are selected from a list of 4329 Experts worldwide ranked by ideXlab platform

Chun-sheng Weng - One of the best experts on this subject based on the ideXlab platform.

  • Experimental study on the Detonation Process of a pulse Detonation engine with ionized seeds
    Defence Technology, 2020
    Co-Authors: Lin Ling, Hu Yanbin, Hongyu Jiao, Chun-sheng Weng
    Abstract:

    Abstract An experimental platform of a pulse Detonation engine (PDE) was established to study the effect of different K2CO3 ionized seed mass contents on the Detonation Process. The pressure and ion concentration were detected in the Detonation Process of the PDE with different contents of ionized seeds. The initiation Process of the PDE at different ignition frequencies was studied. The results show that the gas conductivity in the Detonation Process increased by adding ionized seeds to the PDE tube, and the conductivity increased with the increase in ionized seed mass content. With the increase in ionized seed mass content, the range of the conductivity decreased. The PDE was successfully ignited and formed a stable Detonation wave at ignition frequencies of 5 Hz and 10 Hz, and the peak pressure of the stable Detonation with the ignition frequency of 5 Hz was 17% higher than that with an ignition frequency of 10 Hz. The Detonation wave intensity was weakened and degenerated to a shock wave that propagated in the tube without the fuel filled at the ignition frequency of 20 Hz.

  • Study on the effects of ionization seeds on pulse Detonation characteristics
    Aerospace Science and Technology, 2017
    Co-Authors: Lin Ling, Chun-sheng Weng, Qingzhang Chen, Hongyu Jiao
    Abstract:

    Abstract Ionization phenomenon is happened on the wave front due to the presence of high temperature and pressure in the Detonation Process. Plasma produced in the Detonation Process can be used as magnetohydrodynamic (MHD) generator or flow controlled by the external magnetic field. However, it is necessary to increase the ionization efficiency by adding metal ions with lower ionization potential owing to the limited amount of plasma produced by Detonation. In this paper, a model of pulse Detonation engine with ionization seeds was established. The Conservation Element and Solution Element (CE/SE) method was deduced to simulate the interaction between plasma and Detonation Process. The influence of ionization seed contents on the electrical conductivity and Detonation characteristic parameters was analyzed, and the MHD control of Detonation Process was realized by adding the external electromagnetic field device. The results showed that it had a little influence on the Detonation Process but a great influence on the generation of Detonation plasma by the addition of a certain amount of ionized seed. The ion mass fraction and electrical conductivity in the Detonation tube were first increased and then decreased with the increase of ionization seed content, which reached the maximum at the ionization seed mass fraction of 0.05. The acceleration and deceleration Process could be achieved by the MHD control.

  • Research on filling Process of fuel and oxidant during Detonation based on absorption spectrum technology
    International Symposium on Optoelectronic Technology and Application 2014: Laser and Optical Measurement Technology; and Fiber Optic Sensors, 2014
    Co-Authors: Chun-sheng Weng
    Abstract:

    Research on Detonation Process is of great significance for the control optimization of pulse Detonation engine. Based on absorption spectrum technology, the filling Process of fresh fuel and oxidant during Detonation is researched. As one of the most important products, H 2 O is selected as the target of Detonation diagnosis. Fiber distributed Detonation test system is designed to enable the Detonation diagnosis under adverse conditions in Detonation Process. The test system is verified to be reliable. Laser signals at different working frequency (5Hz, 10Hz and 20Hz) are detected. Change of relative laser intensity in one Detonation circle is analyzed. The duration of filling Process is inferred from the change of laser intensity, which is about 100~110ms. The peak of absorption spectrum is used to present the concentration of H 2 O during the filling Process of fresh fuel and oxidant. Absorption spectrum is calculated, and the change of absorption peak is analyzed. Duration of filling Process calculated with absorption peak consisted with the result inferred from the change of relative laser intensity. The pulse Detonation engine worked normally and obtained the maximum thrust at 10Hz under experiment conditions. The results are verified through H 2 O gas concentration monitoring during Detonation.

Dipshikha Chakravortty - One of the best experts on this subject based on the ideXlab platform.

  • Development of micro-shock wave assisted dry particle and fluid jet delivery system
    Applied Microbiology and Biotechnology, 2012
    Co-Authors: S. G. Rakesh, Divya Prakash Gnanadhas, Uday Sankar Allam, Karaba N. Nataraja, Gopalan Jagadeesh, P K Barhai, Dipshikha Chakravortty
    Abstract:

    Small quantity of energetic material coated on the inner wall of a polymer tube is proposed as a new method to generate micro-shock waves in the laboratory. These micro-shock waves have been harnessed to develop a novel method of delivering dry particle and liquid jet into the target. We have generated micro-shock waves with the help of reactive explosive compound [high melting explosive (octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine) and traces of aluminium] coated polymer tube, utilising ∼9 J of energy. The Detonation Process is initiated electrically from one end of the tube, while the micro-shock wave followed by the products of Detonation escape from the open end of the polymer tube. The energy available at the open end of the polymer tube is used to accelerate tungsten micro-particles coated on the other side of the diaphragm or force a liquid jet out of a small cavity filled with the liquid. The micro-particles deposited on a thin metal diaphragm (typically 100-μm thick) were accelerated to high velocity using micro-shock waves to penetrate the target. Tungsten particles of 0.7 μm diameter have been successfully delivered into agarose gel targets of various strengths (0.6–1.0 %). The device has been tested by delivering micro-particles into potato tuber and Arachis hypogaea Linnaeus (ground nut) stem tissue. Along similar lines, liquid jets of diameter ∼200–250 μm (methylene blue, water and oils) have been successfully delivered into agarose gel targets of various strengths. Successful vaccination against murine salmonellosis was demonstrated as a biological application of this device. The penetration depths achieved in the experimental targets are very encouraging to develop a future device for biological and biomedical applications.

S. G. Rakesh - One of the best experts on this subject based on the ideXlab platform.

  • Development of micro-shock wave assisted dry particle and fluid jet delivery system
    Applied Microbiology and Biotechnology, 2012
    Co-Authors: S. G. Rakesh, Divya Prakash Gnanadhas, Uday Sankar Allam, Karaba N. Nataraja, Gopalan Jagadeesh, P K Barhai, Dipshikha Chakravortty
    Abstract:

    Small quantity of energetic material coated on the inner wall of a polymer tube is proposed as a new method to generate micro-shock waves in the laboratory. These micro-shock waves have been harnessed to develop a novel method of delivering dry particle and liquid jet into the target. We have generated micro-shock waves with the help of reactive explosive compound [high melting explosive (octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine) and traces of aluminium] coated polymer tube, utilising ∼9 J of energy. The Detonation Process is initiated electrically from one end of the tube, while the micro-shock wave followed by the products of Detonation escape from the open end of the polymer tube. The energy available at the open end of the polymer tube is used to accelerate tungsten micro-particles coated on the other side of the diaphragm or force a liquid jet out of a small cavity filled with the liquid. The micro-particles deposited on a thin metal diaphragm (typically 100-μm thick) were accelerated to high velocity using micro-shock waves to penetrate the target. Tungsten particles of 0.7 μm diameter have been successfully delivered into agarose gel targets of various strengths (0.6–1.0 %). The device has been tested by delivering micro-particles into potato tuber and Arachis hypogaea Linnaeus (ground nut) stem tissue. Along similar lines, liquid jets of diameter ∼200–250 μm (methylene blue, water and oils) have been successfully delivered into agarose gel targets of various strengths. Successful vaccination against murine salmonellosis was demonstrated as a biological application of this device. The penetration depths achieved in the experimental targets are very encouraging to develop a future device for biological and biomedical applications.

Hongyu Jiao - One of the best experts on this subject based on the ideXlab platform.

  • Experimental study on the Detonation Process of a pulse Detonation engine with ionized seeds
    Defence Technology, 2020
    Co-Authors: Lin Ling, Hu Yanbin, Hongyu Jiao, Chun-sheng Weng
    Abstract:

    Abstract An experimental platform of a pulse Detonation engine (PDE) was established to study the effect of different K2CO3 ionized seed mass contents on the Detonation Process. The pressure and ion concentration were detected in the Detonation Process of the PDE with different contents of ionized seeds. The initiation Process of the PDE at different ignition frequencies was studied. The results show that the gas conductivity in the Detonation Process increased by adding ionized seeds to the PDE tube, and the conductivity increased with the increase in ionized seed mass content. With the increase in ionized seed mass content, the range of the conductivity decreased. The PDE was successfully ignited and formed a stable Detonation wave at ignition frequencies of 5 Hz and 10 Hz, and the peak pressure of the stable Detonation with the ignition frequency of 5 Hz was 17% higher than that with an ignition frequency of 10 Hz. The Detonation wave intensity was weakened and degenerated to a shock wave that propagated in the tube without the fuel filled at the ignition frequency of 20 Hz.

  • Study on the effects of ionization seeds on pulse Detonation characteristics
    Aerospace Science and Technology, 2017
    Co-Authors: Lin Ling, Chun-sheng Weng, Qingzhang Chen, Hongyu Jiao
    Abstract:

    Abstract Ionization phenomenon is happened on the wave front due to the presence of high temperature and pressure in the Detonation Process. Plasma produced in the Detonation Process can be used as magnetohydrodynamic (MHD) generator or flow controlled by the external magnetic field. However, it is necessary to increase the ionization efficiency by adding metal ions with lower ionization potential owing to the limited amount of plasma produced by Detonation. In this paper, a model of pulse Detonation engine with ionization seeds was established. The Conservation Element and Solution Element (CE/SE) method was deduced to simulate the interaction between plasma and Detonation Process. The influence of ionization seed contents on the electrical conductivity and Detonation characteristic parameters was analyzed, and the MHD control of Detonation Process was realized by adding the external electromagnetic field device. The results showed that it had a little influence on the Detonation Process but a great influence on the generation of Detonation plasma by the addition of a certain amount of ionized seed. The ion mass fraction and electrical conductivity in the Detonation tube were first increased and then decreased with the increase of ionization seed content, which reached the maximum at the ionization seed mass fraction of 0.05. The acceleration and deceleration Process could be achieved by the MHD control.

Lin Ling - One of the best experts on this subject based on the ideXlab platform.

  • Experimental study on the Detonation Process of a pulse Detonation engine with ionized seeds
    Defence Technology, 2020
    Co-Authors: Lin Ling, Hu Yanbin, Hongyu Jiao, Chun-sheng Weng
    Abstract:

    Abstract An experimental platform of a pulse Detonation engine (PDE) was established to study the effect of different K2CO3 ionized seed mass contents on the Detonation Process. The pressure and ion concentration were detected in the Detonation Process of the PDE with different contents of ionized seeds. The initiation Process of the PDE at different ignition frequencies was studied. The results show that the gas conductivity in the Detonation Process increased by adding ionized seeds to the PDE tube, and the conductivity increased with the increase in ionized seed mass content. With the increase in ionized seed mass content, the range of the conductivity decreased. The PDE was successfully ignited and formed a stable Detonation wave at ignition frequencies of 5 Hz and 10 Hz, and the peak pressure of the stable Detonation with the ignition frequency of 5 Hz was 17% higher than that with an ignition frequency of 10 Hz. The Detonation wave intensity was weakened and degenerated to a shock wave that propagated in the tube without the fuel filled at the ignition frequency of 20 Hz.

  • Study on the effects of ionization seeds on pulse Detonation characteristics
    Aerospace Science and Technology, 2017
    Co-Authors: Lin Ling, Chun-sheng Weng, Qingzhang Chen, Hongyu Jiao
    Abstract:

    Abstract Ionization phenomenon is happened on the wave front due to the presence of high temperature and pressure in the Detonation Process. Plasma produced in the Detonation Process can be used as magnetohydrodynamic (MHD) generator or flow controlled by the external magnetic field. However, it is necessary to increase the ionization efficiency by adding metal ions with lower ionization potential owing to the limited amount of plasma produced by Detonation. In this paper, a model of pulse Detonation engine with ionization seeds was established. The Conservation Element and Solution Element (CE/SE) method was deduced to simulate the interaction between plasma and Detonation Process. The influence of ionization seed contents on the electrical conductivity and Detonation characteristic parameters was analyzed, and the MHD control of Detonation Process was realized by adding the external electromagnetic field device. The results showed that it had a little influence on the Detonation Process but a great influence on the generation of Detonation plasma by the addition of a certain amount of ionized seed. The ion mass fraction and electrical conductivity in the Detonation tube were first increased and then decreased with the increase of ionization seed content, which reached the maximum at the ionization seed mass fraction of 0.05. The acceleration and deceleration Process could be achieved by the MHD control.