Browse Publications Technical Papers 2019-01-0200
2019-04-02

Influence of Key Section Parameters of Exhaust Port on Flow Capacity 2019-01-0200

A three-dimensional model of a diesel engine exhaust port was created. The modeling method and the actual model were validated by the steady-flow test. Based on this model, the influence of the key section parameters such as inlet area S1, throat area S2, and the outlet area S3 on the flow capacity of the exhaust port was studied. The results show that, under the conditions of different pressure difference and exhaust back pressure, the flow quantity increases first and then converges with the increase of the area ratio of outlet and inlet Ko or the area ratio of throat and inlet Kt. The optimum area ratio of outlet and inlet Ko,opt decreases with the increase of the flow velocity but the optimum area ratio of throat and inlet Kt,opt increases with the increase of the flow velocity. So under the same pressure difference, with the increase of the back pressure, the optimum area ratio of outlet and inlet Ko,opt increases but the optimum area ratio of throat and inlet Kt,opt decreases. Under the same back pressure, with the increase of the pressure difference, the optimum area ratio of outlet and inlet Ko,opt decreases and converges to 1.02, but the optimum area ratio of throat and inlet Kt,opt increases and converges to 1.13.

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