Fei's Dissertation

Fei's Dissertation - ABSTRACT ZHENG, FEI. Computational...

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Unformatted text preview: ABSTRACT ZHENG, FEI. Computational Investigation of High Speed Pulsjets. (Under the direction of Dr. William L. Roberts). Pulsejet may be the simplest propulsion system ever. Due to its simplicity, the pulsejet may be an ideal low-cost micro-propulsion system. Although a considerable amount of work has been done on developing different types of pulsejets, understanding of the operation of these jets is still very limited. One goal of this investigation is to study the valveless pulsejet, find out effect of the geometry of inlet, combustion chamber and tailpipe on the performance of valveless pulsejet. Another goal is to study effect of the environment, such as free stream speed, ambient pressure and temperature, on the performance of pulsejet. In this work, combined computational and experimental methods were used to study valved and valveless pulsejets to develop an understanding of how various inlets, exhaust sizes and coming flow speed effect the overall performance of the jet. Focus is put on the computational study. Fluid mechanics, acoustics and combustion were studied numerically to understand the operation of pulsejets and their interactive with the environment. The research objectives include the principles of valveless pulsejet design, optimize valveless pulsejet geometries and the effect of ejector and shroud. Computational Investigation of High Speed Pulsejets by Fei Zheng A dissertation submitted to the Graduate Faculty of North Carolina State University In partial fulfillment of the Requirements for the degree of Doctor of Philosophy Mechanical Engineering Raleigh, North Carolina August 17, 2009 APPROVED BY: _______________________________ ______________________________ Dr. William L. Roberts Dr. Andrey V. Kuznetsov Committee Chair Committee Co-Chair ________________________________ ________________________________ Dr. Terry D. Scharton Dr. Tiegang Fang ________________________________ Dr. Renzo Shamey ii BIOGRAPHY The author was born Fei Zheng of Suzhou, Jiangsu province, China in 1975, son of Dingchang Zheng and Yuanmei Li. He grew up in Taiyuan, Shanxi Province and graduated from The First High School of Taiyuan Railway in 1992. Immediately following high school, Fei attended University of Sciences and Technology of China, where he received his Bachelor of Science in Thermal Science Engineering in July, 1997. After graduate, he got a job in Institute of Electrical Engineering, Chinese Academy of Sciences, where his research was focused on Solar Thermal energy for 8 years. During this period, he studied for his Master‘s degree from 2000 and 2003, under the direction of Professor Anding Li, and received his Master degree in Electrical Engineering in July, 2003....
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This note was uploaded on 05/10/2011 for the course MAE 472 taught by Professor Peters during the Spring '08 term at N.C. State.

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Fei's Dissertation - ABSTRACT ZHENG, FEI. Computational...

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