Explanation of the mechanisms of unsteady gas flow through the turbocharger seal system,including thermal and structural interactions  

作　　者：P.Novotný P.Kudlácek J.Vacula 

机构地区：[1]Brno University of Technology,Brno,Technicka 2896/2,61669,Czech Republic

出　　处：《Propulsion and Power Research》2023年第2期180-198,共19页推进与动力（英文）

基　　金：The research leading to these results has received funding from the Specific research program at Brno University of Technology,reg.no.FSI-S-20-6267.

摘　　要：Gas flow in the seal system can be expected during the operation of a turbocharger and is associated with negative effects on the quality of the lubricant or turbocharger efficiency.Gas flow also affects particulate matter production due to lubricant entrainment in the compressor or turbine.The prediction of gas flow rates depends on many design parameters and the operating conditions of the turbocharger,but sufficiently accurate descriptions of the gas flow mechanisms and their quantification depending on the operating conditions have not yet been presented.The proposed computational approach simultaneously solves the gas dynamics in the seal system,the heat transfer in the turbocharger rotor-bearing system and the dynamics of the seal rings and rotor,including the bearings.The computational model for the turbocharger of a heavy-duty vehicle engine is experimentally validated.Two mechanisms have major influences on gas mass flow:the gas flow through the thin gap between the moving ring and groove and the flow through the ring gap.The results show that the importance of these mechanisms depends on several geometrical dimensions of the seal system and the operating conditions of the turbocharger,with a strong connection to the rotor dynamics and thermal load of the impellers.Influences involving rotor movement or rotor thermal conditions are crucial,and their non-inclusion limits the ability to correctly predict gas mass flow.

关 键 词：Gas blow-by Gas flow Heat transfer Rotor dynamics TURBOCHARGER Seal system 

分 类 号：TK14[动力工程及工程热物理—热能工程]