CAJ | 학술논문

在双下侧冲压发动机地面连管试验中发现实测推力与一维流计算数据相差较大，为探究差异根源，以数值仿真为基础，对比分析了补燃室中均匀流场和非均匀流场对冲压喷管推力特性的影响。分析结果表明，流场的非均匀性导致计算截面上的实际滞止参数与理论计算数据有差异，因此，在这种条件下，不能直接利用一维流理论进行计算；同时，文中在仿真及试验基础上给出了非均匀性对推力影响的工程估算方法。
재쌍하측충압발동궤지면련관시험중발현실측추력여일유류계산수거상차교대，위탐구차이근원，이수치방진위기출，대비분석료보연실중균균류장화비균균류장대충압분관추력특성적영향。분석결과표명，류장적비균균성도치계산절면상적실제체지삼수여이론계산수거유차이，인차，재저충조건하，불능직접이용일유류이론진행계산；동시，문중재방진급시험기출상급출료비균균성대추력영향적공정고산방법。
The thrust of a ramjet measured in the direct-connected experiment was obviously different from the thrust based on 1D theoreti-cal calculation, to analysis the cause of above phenomenon, the research on the effect of uniformity of flow field on thrust was conducted on the basis of 3D numerical simulation, the results show that the uniformity of flow field makes a obvious difference between the results by 3D simulation and the results by 1D theoretical calculation on the stagnation parameters in key section of ramjet. Therefore, the thrust acquired by 1D theoretical calculation is incorrect under the condition that flow field is uneven. Furthermore the method to predict the effect of uni-formity of flow field on thrust is presented.