关键词: 高超声速进气道;数值仿真;内压式进气道;隔离器;曲面;构型

Abstract: For design of internal contraction tunnel and isolator of two-dimensional hypersonic inlet,curved surface structure at the bottom wall was presented.Based on a series of plane surfaced hypersonic inlets with different internal contraction area ratios and different shocks,curved surface models with different radii were designed and simulated with N-S equation.Effects of arc transition radius on inlet performances(e.g.temperature and pressure rise ratios,exit Mach number,total pressure recovery and starting Mach number) were investigated.The unnecessary expansion at the shoulder was weakened and the great local pressure at the isolator entrance was reduced as well as the flow at the entrance was more uniform.The starting-up Mach number was decreased.The greater radius and internal contraction area ratio,the more decreased.The total pressure recovery was increased greatly by the new design.Even if without shock-on-shoulder,the inlet has better performance.

Key words: Hypersonic inlet;Numerical simulation;Internal compression inlet;Isolator;Curved surface;Configuration