本文是引用新的物理量后，建立了柴油发动机排气压力波气缸端新的边界方程序。

Equations of the boundary conditions at the end of the exhaust pipe have been rewritten after introducing new variables.

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发动机压力比(epr)，进气压力与排气压力值的比，某些发动机以此作为设定推力的主要依据。

Engine pressure ratio (EPR), the ratio of inlet pressure over exhaust-let pressure measurements. The ratio is used as the primary parameter to set thrust on some engines.

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汽车发动机的排气压力大，温度高，具有较高品位的热能，能开发利用。

With high exhaust pressure and high temperature, motor engines have relatively high-quality heat energy, which thus may be developed and applied.

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