The Experts below are selected from a list of 23541 Experts worldwide ranked by ideXlab platform

Baolong Wang - One of the best experts on this subject based on the ideXlab platform.

  • a colour sequence enhanced particle streak velocimetry method for Air Flow Measurement in a ventilated space
    Building and Environment, 2017
    Co-Authors: Huan Wang, Xianting Li, Xiaoliang Shao, Baolong Wang
    Abstract:

    Abstract AirFlow Measurement is crucially important for studying the indoor environment. Two primary approaches that use bubbles as seeds to visualize and track the Air Flow are Particle Tracking Velocimetry (PTV) and Particle Streak Velocimetry (PSV). After analysing their advantages and drawbacks, this paper introduces a new approach: Colour Sequence enhanced Particle Streak Velocimetry (CSPSV). The core component of CSPSV is the newly designed Colour Sequence Illumination System (CSIS), which consists of three types of controlled flash lights of different colours and one type of white light. By changing the illumination colour of the test zone in a given sequence, the time sequence information is added onto a single image, which enables easier execution of the algorithm for three-dimensional (3D) reconstruction and streak pAir matching. A CSPSV prototype was developed by marking the time sequence information with coloured light, and the accuracy of the CSPSV prototype was verified by comparing the movement of white dots on a rotating board. The weak jet and thermal plumes were also measured to demonstrate the reliability of the CSPSV method. It is observed that the relative magnitude error is below 5%, and CSPSV combines the advantages of PTV and PSV, which reduces the requirement for high-speed cameras. In addition, the new approach can be easily extended and used to measure the Air Flow in a large space.

Huan Wang - One of the best experts on this subject based on the ideXlab platform.

  • a colour sequence enhanced particle streak velocimetry method for Air Flow Measurement in a ventilated space
    Building and Environment, 2017
    Co-Authors: Huan Wang, Xianting Li, Xiaoliang Shao, Baolong Wang
    Abstract:

    Abstract AirFlow Measurement is crucially important for studying the indoor environment. Two primary approaches that use bubbles as seeds to visualize and track the Air Flow are Particle Tracking Velocimetry (PTV) and Particle Streak Velocimetry (PSV). After analysing their advantages and drawbacks, this paper introduces a new approach: Colour Sequence enhanced Particle Streak Velocimetry (CSPSV). The core component of CSPSV is the newly designed Colour Sequence Illumination System (CSIS), which consists of three types of controlled flash lights of different colours and one type of white light. By changing the illumination colour of the test zone in a given sequence, the time sequence information is added onto a single image, which enables easier execution of the algorithm for three-dimensional (3D) reconstruction and streak pAir matching. A CSPSV prototype was developed by marking the time sequence information with coloured light, and the accuracy of the CSPSV prototype was verified by comparing the movement of white dots on a rotating board. The weak jet and thermal plumes were also measured to demonstrate the reliability of the CSPSV method. It is observed that the relative magnitude error is below 5%, and CSPSV combines the advantages of PTV and PSV, which reduces the requirement for high-speed cameras. In addition, the new approach can be easily extended and used to measure the Air Flow in a large space.

Craig Penterson - One of the best experts on this subject based on the ideXlab platform.

  • ACCURATE BURNER Air Flow Measurement FOR LOW NOx BURNERS
    2014
    Co-Authors: Dave Earley, Craig Penterson
    Abstract:

    In 1990, Congress enacted an amendment to the Clean Air Act that required reductions in NOx emissions through the application of low NOx burner systems on fossil fueled utility steam generators. For most of the existing steam generator population, the original burning equipment incorporated highly turbulent burners that created significant in-furnace flame interaction. Thus, the Measurement and control of Air Flow to the individual burners was much less critical than in recent years with low NOx combustion systems. With low NOx sys-tems, the reduction of NOx emissions, as well as minimizing flyash unburned carbon levels, is very much dependent on the ability to control the relative ratios of Air and fuel on a per-burner basis and their rate of mixing, particularly in the near burner zones. AMC Power (AMC) and DB Riley, Inc. (DBR), and a large Midwestern electric utility have successfully developed and applied AMC’s equipment to low NOx coal burners in order to enhance NOx control combustion systems. The results have improved burner optimization and provided real time continuous Air Flow balancing capability and the control of individual burner stoichiometries. To date, these enhancements have been applied to wall-fired low NOx systems for balanc-ing individual burner Air Flows in a common windbox and to staged combustion systems. Most recently, calibration testing in a wind tunnel facility of AMC’s individual burner Air Measurement (IBAM™) probes installed in DB Riley’s low NOx CCV ® burners has demon-strated the ability to produce reproducible and consistent Air Flow Measurement accurate to within 5%. This paper will summarize this product development and quantify the benefits of its application to low NOx combustion systems

Rodney K Bogue - One of the best experts on this subject based on the ideXlab platform.

  • optical Air Flow Measurements for flight tests and flight testing optical Air Flow meters
    2005
    Co-Authors: Henk W Jentink, Rodney K Bogue
    Abstract:

    Optical Air Flow Measurements can support the testing of Aircraft and can be instrumental to in-flight investigations of the atmosphere or atmospheric phenomena. Furthermore, optical Air Flow meters potentially contribute as avionics systems to flight safety and as Air data systems. The qualification of these instruments for the flight environment is where we encounter the systems in flight testing. An overview is presented of different optical Air Flow Measurement techniques applied in flight and what can be achieved with the techniques for flight test purposes is reviewed. All in-flight optical AirFlow velocity Measurements use light scattering. Light is scattered on both Air molecules and aerosols entrained in the Air. Basic principles of making optical Measurements in flight, some basic optical concepts, electronic concepts, optoelectronic interfaces, and some atmospheric processes associated with natural aerosols are reviewed. Safety aspects in applying the technique are shortly addressed. The different applications of the technique are listed and some typical examples are presented. Recently NASA acquired new data on mountain rotors, mountain induced turbulence, with the ACLAIM system. Rotor position was identified using the lidar system and the potentially hazardous Air Flow profile was monitored by the ACLAIM system.

Loeck, Lucas Baracat - One of the best experts on this subject based on the ideXlab platform.

  • Desenvolvimento de protótipo de medição de vazão de ar baseado em orifício em uma tubulação
    2016
    Co-Authors: Loeck, Lucas Baracat
    Abstract:

    A medição de vazão está presente em larga escala em diversos segmentos industriais, além de ter importante papel no cotidiano, como, por exemplo, no consumo de água, gás, gasolina etc. A medição de vazão está muita vezes associada à comercialização de fluidos, como no caso da indústria petrolífera. Portanto a qualidade da medição de vazão é determinante em termos financeiros, tornando cada vez maior o nível de exigência do mercado em relação a medidores com menor erro possível. Este trabalho consiste no desenvolvimento de um protótipo de medição de vazão de ar através do método de orifício. O objetivo principal é medir a vazão de ar que flui dentro de uma tubulação. O método usado utiliza uma placa de orifício como obstáculo ao escoamento que provoca um diferencial de pressão. Este diferencial de pressão é medido, usando um sensor de pressão diferencial piezoresistivo, que gera uma sinal de tensão elétrica analógica. O sinal gerado é, então, condicionado e convertido em um valor equivalente de vazão através de software implementado em uma plataforma comercial Arduino Uno. O sistema de medição desenvolvido neste trabalho se propõe a medir vazão de ar de 15m3=h a 50m3=h. A resolução de entrada obtida é de 0; 125m3=h e o erro de conformidade apresentado da função de transferência experimental do sistema é de 0; 41% do fundo de escala. As medidas obtidas a partir do sistema desenvolvido foram comparadas às de um medidor de vazão comercial. Dessa forma, a máxima diferença entre os dois medidores foi de 0,46% do fundo de escala. Portanto, a partir do protótipo desenvolvido neste trabalho, foi possível medir vazão de ar em uma tubulação.Flow Measurement is present in large scale in diverse industrial sectors, besides having an important role in daily life, as, for exmaple, in the consumption of water, LP gas, gasoline etc. Flow Measurement is often associated with the commercialization of fluids, such as in the oil industry. Thus, the quality of Flow Measurement is determinant in financial terms, increasing the level of demand for meters with minimal error in the market. This work consists on the development of a prototype of Air Flow Measurement based in the method of orifice. The main goal is to measure Air Flow inside a pipe. The method used in this work utilizes an orifice plate as an obstacle to the Flow which causes a pressure drop. This differential pressure is measured using a piezoresistive differential pressure sensor, which generates a signal of analog voltage. Then, the generated signal is conditioned and converted to an equivalent value of Flow through software implemented in a comercial platform Arduino Uno. The system of Measurement developed in this work proposes to measure Air Flow from 15m3=h to 50m3=h. The input resolution obtained is of 0:125m3=h and the conformity error of the transfer function presented is of 0:41% of full scale. The measures obtained from the system developed in this work were compared to measures from a comercial Flowmeter. The maximum difference between the two meters was of 0,46% of full scale. Thus, through the prototype developed in this work, the Measurement o Air Flow in a pipe was achieved