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对在给定条件下设计的拉瓦尔喷管进行了数值模拟分析和验证,分别采用进口压强为3.9×105 Pa、5.78×105 Pa、11.9×105 Pa和15.6×105 Pa的模拟结果与设计值7.8×105 Pa的模拟结果进行了比较,并得出设计的拉瓦尔喷管比较合理能够满足实验要求。同时模拟分析了在喷管末端增加一凹槽对喷管尾部气流的影响,研究表明凹槽的存在有利于气流的扰动,从而促进燃料的充分混合和燃烧。
Numerical simulation analysis and verification of Laval nozzle designed under the given conditions were carried out. The simulation results and design values of inlet pressure of 3.9 × 105 Pa, 5.78 × 105 Pa, 11.9 × 105 Pa and 15.6 × 105 Pa were used respectively. 7.8 × 105 Pa simulation results were compared, and draw Laval nozzle design is more reasonable to meet the experimental requirements. At the same time, the effect of adding a groove at the end of the nozzle on the airstream of the nozzle was simulated and analyzed. The results show that the existence of the groove is conducive to the disturbance of the air flow and thus promotes the thorough mixing and combustion of the fuel.