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Numerical analysis of aerodynamic characteristics of sedan driving in wind and rainfall environment

Published:2015-06-08 author:FENG Wei，DU Li-ming，NI Shou-long Browse: 2577 Check PDF documents

Numerical analysis of aerodynamic characteristics of sedan driving

in wind and rainfall environment

FENG Wei，DU Li-ming，NI Shou-long

（Province Key Lab of Vehicle Engineering Advanced Technology，Dalian Jiaotong University，

Dalian 116028，China）

Abstract：Aiming at solving the problems of aerodynamic characteristics and operation safety issues of the sedan under extreme weather

conditions（crosswind and rainfall），a three-dimensional numerical model of the sedan was established. By applying two phases low model，

aerodynamic characteristics of the Sedan running in three climatic conditions（no wind，wind，rainfall） with different speeds were

numerically researched and air flow field and aerodynamic force characteristics around the sedan were analyzed by comparison.

Aerodynamic characteristics of the sedan running in coupling of cross wind and rain was numerically researched. The results indicate that

aerodynamic drag of the sedan running in rainfall is increased by about 30% and trim moment increases by 3.42%~0.72%，compared

with in condition of no rainfall. It is also indicates that the lift of the sedan is increased by 87%~185% in the condition of crosswind and

rainfall and the surface pressure and yawing moment of the sedan are increased obviously with the increasing power of lateral wind，

which cause remarkable impact on the driving safety of the sedan.

Key words：wind and rain environment；aerodynamic characteristics；numerical simulation；crosswind；rainfall

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