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Trends in Applied Sciences Research
  Year: 2012 | Volume: 7 | Issue: 11 | Page No.: 922-928
DOI: 10.3923/tasr.2012.922.928
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Numerical and Experimental Study of Thrust Force of Valve-less Pulse Jet

Ahmad Afsari, Ali Reza Tahavvor and Yousef Bazargan-Lari

Pulse jets are characterized by simplicity, low cost of construction and high noise levels. Pulse jet fuel efficiency is a topic for hot debate, as efficiency is a relative term. The high noise levels usually make them impractical for other than military and other similarly restricted applications. However, pulse jets are used on a large scale as industrial drying systems and there has been a new surge to study and apply these engines to applications such as high-output heating, biomass conversion and alternative energy systems. In this study, testing is performed on the 450 cm pulse jet engine. Main objective of present study is finding and scaling laws and design characteristics of the pulse jets in order to optimization of the engines. The pulse jet used in this study is valve-less with propane fuel. Scaling capabilities of a valve less pulse jet are studied by varying inlet length, exit length, type of exit geometry and inlet area to combustor area ratio. Also, engine performance is defined by measuring chamber pressure, internal gas temperature, thrust and fuel flow rate. The scaling capability is characterized by the success of self-sustained combustion for each corresponding geometric configuration. Tailpipe length is found to be a function of valve less inlet length and may be further minimized by the addition of a diverging exit nozzle. Ranges of geometric configurations of this engine contain combustion chamber with 10.8, 5 cm inlet diameter, 12 cm exit diameter and 12 N thrust.
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How to cite this article:

Ahmad Afsari, Ali Reza Tahavvor and Yousef Bazargan-Lari, 2012. Numerical and Experimental Study of Thrust Force of Valve-less Pulse Jet. Trends in Applied Sciences Research, 7: 922-928.

DOI: 10.3923/tasr.2012.922.928






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