相同条件下，多变指数n增大，表明微喷管散热增加，将引起微喷管出口速度和当地声速减小，马赫数则随多变指数增大而增大。
At the same condition , polytropic exponent increases , meaning heat loss from the nozzle increases , will lead to outlet velocity and local acoustic velocity decreasing , but Mach number increasing .
当地声速