CAJ | 학술논문

本文中针对同时采用排气制动和涡轮增压的车辆,分析其在排气制动工况下增压器的工作状态。通过排气制动与增压器联动试验得出数值计算所需的边界条件,并据此计算涡轮转子在稳态工况和过渡工况的轴向受力。结果表明,在排气制动工况下,增压器涡轮转子的轴向受力反向,且排气背压越高,涡轮转子所受轴向力越大；在工况切换过程中,涡轮转子所受突变载荷较大,最高值达221N,工况切换时间越短、背压越高,轴向冲击载荷越大。因此确定合理的排气背压和工况切换策略可有效降低涡轮转子所承受的轴向载荷。
본문중침대동시채용배기제동화와륜증압적차량,분석기재배기제동공황하증압기적공작상태。통과배기제동여증압기련동시험득출수치계산소수적변계조건,병거차계산와륜전자재은태공황화과도공황적축향수력。결과표명,재배기제동공황하,증압기와륜전자적축향수력반향,차배기배압월고,와륜전자소수축향력월대；재공황절환과정중,와륜전자소수돌변재하교대,최고치체221N,공황절환시간월단、배압월고,축향충격재하월대。인차학정합리적배기배압화공황절환책략가유효강저와륜전자소승수적축향재하。
In this paper, the working states of turbocharger in exhaust braking condition are analyzed for the vehicles concurrently adopting exhaust braking and turbocharging. Through a linked test with both exhaust bra-king and turbocharging functioning, the boundary conditions required for numerical calculation are obtained, and based on which the axial forces of turbine in both steady and transitional conditions are calculated. The results show that in exhaust braking condition, the axial force of turbine reverses its direction, and the higher the exhaust back-pressure the larger the axial force. In the process of working condition switching, the turbine is subjected to high shock load with a highest value up to 221N, and the shorter switching time and higher back pressure will lead to a greater impact load. Hence selecting a reasonable backpressure and an appropriate witching strategy can effectively reduce the axial load of turbine.