双变量超音速动力装置的统一动态模型
INTEGRATED DYNAMIC MODEL OF TWO-VARIABLE SUPERSONIC INLET-ENGINE COMBINATION
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摘要: 本文提出了将超音速进气道-发动机装置(简称动力装置)作为统一控制对象的双变量(进气道结尾正激波位移与发动机转速)动态模型。在作者前一篇论文的基础上,本文进一步考虑了动态过程中发动机对进气道的流量反馈机理,并采用矩阵分式描述法进行模型的频域向时域转换,因而使模型更趋近于反映实际。对NASA的48cm进气道—J85发动机装置的数字模拟表明,结果是满意的。Abstract: An integrated dynamic model of a two-variable (normal shock position and engine speed) inlet-engine combination is formulated on the basis of the idea in author’s former paper, but the effect of engine flow feedback on the inlet during transient period is taken into consideration and the matrix fraction description method is applied to transforming frequency domain into state space domain in the model. The results of a sample digital simulation for NASA 48cm inlet-J85 engine combination show that the method of formulation is satisfactory.
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