排气制动对增压器轴向载荷影响的研究

摘要

针对车辆上同时应用排气制动与涡轮增压的情况，研究了排气制动对增压器轴向载荷的影响。通过排气制动与增压器联动试验测量了增压器在各个工况下的轴向载荷，从而确定了数值计算所需的边界条件，并通过数值计算获取了增压器在各个工况的轴向载荷的分布情况。结果表明，与正常工况相比，增压器在排气制动工况下其轴向载荷显著增大，且排气背压越高，增压器轴向载荷越大；涡轮级轴向载荷反向且增大；压气机级轴向载荷显著下降，但方向不变。%The effects of exhaust braking on the axial thrust of turbocharger are studied for the vehicles with both exhaust braking and turbo-charging applied. The axial thrust of turbocharger in different working conditions are measured by the linkage test of exhaust braking and turbo-charging with the boundary conditions for numerical com-putation determined, and the distribution patterns of axial thrust of turbocharger in different conditions are obtained by numerical computation. The results show that compared with normal condition, in exhaust braking condition, the axial thrust of turbocharger significantly increases ( the higher the exhaust back pressure, the larger the axial thrust of turbocharger) , the axial thrust of turbine increases with its direction reversed, and the axial thrust of compressor greatly reduces with its direction unchanged.