汽油机缸内瞬时换热系数的理论推导

Theoretic Derivation of Transient Heat Interchange Coefficient in Gasolene Engine Cylinder

本文应用能量守恒和边界层理论,在可接受的假设条件下,经过理论推导和试验数据的拟合,获得了汽油机缸盖瞬时换热系数计算的关系式。并将根据该计算式的计算值和相应工况的实测值作了比较,两者是十分相近的。此外,关于燃气温度T_g对α值的影响众说纷纭。本文经过理论推导所得出的T_g对α值的影响的结论也有助于对这一问题的探讨。

Applying low of conservation of energy and boundary layer theory, under acceptable supposed conditions, through correction of the theoretical derivation by the test data, this PaPer propounds a relational expression for calculation of gasolene engine cylinder head transient heat interchange coefficient, and compares calculated value of the expression with measured value under the relevant operating conditions.These two values are very close. In addition, there are varieties of opinions about the effect of combusting gas temperature T_g on valueа . The conclusion drawn from this Paper about the influence of T_g onа is be a help to discuss this problem.