不同环境压强下塞式喷管流场的数值模拟

NUMERICAL SIMULATION OF PLUG NOZZLE FLOWFIELDS AT DIFFERENT AMBIENT PRESSURES

本文设计了一种环排式塞式喷管，通过求解Ｎ－Ｓ雷诺平均方程组，对在不同环境压强情况下该塞式喷管的流场结构进行了数值模拟，对采用单方程和双方程两种紊流模型模拟的结果进行了比较。数值模拟的结果表明，用适当选取混合长度的单方程模型与双方程模型计算的结果基本一致；该塞式喷管基本上体现了塞式喷管的优点。

A type of circular multi-thruster plug nozzle has been designed,and its flow fields at different ambient pressures were simulated numerically by solving axisymmetric Reynolds-averaged Navier-Stokes equations with a finite-volume formulation.The simulations based on single equation and two equations turbulent models were compared.The results of the both models at proper mixing length were consistent in general.This type of plug nozzle embodies the main advantages of plug nozzles.