Prediction of supersonic inlet unstart caused by freestream disturbances
Prediction of supersonic inlet unstart caused by freestream disturbances
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DOI：
10.2514/3.12418
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发表时间：
1994-01
期刊：
影响因子：
2.5
通讯作者：
D. Mayer;G. Paynter
中科院分区：
文献类型：
--
作者：
D. Mayer;G. Paynter
本文的目的是报告欧拉分析程序的发展进展，以预测超音速进气道的不起动公差。为了帮助理解边界条件问题，开发了一维线性分析程序，并用于分析进气道不起动特性。以这些结果为指导，通过增加新的引气边界条件、压气机端面边界条件和发动机需求模型，扩展了欧拉分析程序，用于模拟自由气流扰动引起的非定常进气流。对20 °和90 °喉道放气构型的轴对称进气道进行了欧拉分析，确定了五种不起动条件。结果表明，温度或速度的增加和减少都会使进气道不起动，而只有压力的降低才会使进气道不起动。研究还发现，90 °喉道放气相对于20 °喉道放气改善了自由端压力降低、温度升高和速度变化的不起动容限。
The objective of this article is to report progress toward the development of an Euler analysis procedure for predicting the unstart tolerance of supersonic inlets. As an aid to understanding boundary condition issues, a one-dimensional, linear-analysis procedure was developed and used to analyze inlet unstart behavior. Using these results as a guide, an Euler analysis procedure was extended through the addition of a new bleed boundary condition, a new compressor face boundary condition, and an engine demand model for the simulation of unsteady inlet flows caused by freestream flow disturbances. Five unstart conditions were identified with the Euler analysis of the axisymmetric inlet for both 20- and 90-deg throat bleed configurations. Results show that both increases and decreases in temperature or velocity will unstart the inlet, whereas only pressure decreases will unstart the inlet. It was also found that 90-deg throat bleed improves the unstart tolerance relative to 20-deg throat bleed for freestream pressure decreases, temperature increases, and changes in velocity.