Affiliation:
1. Department of Chemical Machinery, Dalian University of Technology, Dalian, 116012, China
Abstract
Objective:
The objective of this study is to explore and emphasize the influence
mechanism and law of gas parameters on pressure port design.
Methods:
CFD commercial software FLUENT was used for numerical simulation in this
study, and a three-dimensional numerical model was employed to improve the accuracy
of calculation. The GWE experimental platform was also built to verify the theoretical
and numerical analysis results.
Results:
When the expansion ratio α is raised from 1.35 to 2.0, the average shock velocity
vs can increase by about 4.9%, and when raising the compression ratio from 1.05 to
1.2, the change of vs is only 1.4% relatively. Raising the expansion ratio value from 1.35
to 2.0, the optimal offset of the high- and medium-pressure ports only changes by 5.3%,
and the decrease of the ejection rate caused by the deviation of the aforementioned offset
is only about 4.3%,which proves that the equipment has strong ability to resist fluctuations
of working conditions.
Conclusion:
Moving velocity of the shock wave varies with temperature, working pressure
ratio and adiabatic index of the gas. The increase of high- and low-pressure inlet gas
temperatures will cause an increment of vs and as, and the influence of high-pressure inlet
gas temperature Tht on vs is greater. There are optimal high- and medium-pressure port
offsets under different pressure ratios as the experimental results have shown. When the
pressure ratio remains constant, the change in pressure value does not have a significant
impact on the optimal port design and equipment performance.
Funder
National Natural Science Foundation of China
National Key Research and Development Program of China
Fundamental Research Funds for the Central Universities
Publisher
Bentham Science Publishers Ltd.
Subject
General Chemical Engineering
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