b'Automotive & Transportation | Engineer InnovationThe correlation is very good betweenC11 / Y = 27.67 mmtests and CFD calculations for steady flow. Velocity (m/s) Phase = 11535.0 100Time-dependent conditionsFor the simulation of dynamic behavior, the respective inlet mass flow28.0rates and inlet temperatures of both80fluids (air/coolant) have been kept the same as those in the steady condition21.0study, while two rotating conditions60have been considered corresponding to 1000 and 3000 engine revolutions per14.0X mmminute (RPM). The PIV system has been set up so that the flow can be observed7.0 40between LCAC outlet and runners.This test campaign reached the0.0conclusion that: 20 The flow dynamicity improves the exchanges in both cases (figure 10).0In comparison with steady state, the heat exchanges during the tests have increased by 2.3 percent at 1000rpm0-10-20-30-40-50and 3.7 percent at 3000rpm, whileZ mmwe obtained 2.2 percent and 1.7Figure 12: CFD vs PIV: tangential components of the velocity in a vertical plane at 3000RPMpercent in simulation respectively. From PIV analysis, a good correlation is achieved on the flow. The same flow structures are visible during tests and in CFD calculations (figures 11 and 12).ConclusionThe comparison between test and CFD calculation validates the methodology: Sogefi Air & Cooling now has the means to predict the heat exchanges in a LCAC, whether it is integrated in to its manifolds or not. The fine accuracy of the temperature distribution calculation at LCAC outlet will allow an accurate prediction of the air temperature entering each cylinder in both steady and unsteady conditions. nFigure 13: Air and liquid temperatures at 3000RPM69'