Simulation calculation method for air inlet amount of cabin heat exchanger under transient driving condition

Abstract

The invention discloses a simulation calculation method for the air inlet amount of a cabin heat exchanger under a transient driving condition, which comprises the following steps of: determining sampling points ai, performing steady-state simulation calculation on each sampling point ai, and outputting a statistical average value Q1 of the simulated air inlet rate of each sampling point ai; fitting the sampling points ai with the corresponding average value Q1 of the air inlet volume to obtain a relational expression between the vehicle speed and the air inlet volume, selecting a test point bi, and substituting the test point bi into the relational expression to obtain a statistical average value Q2 of the calculated air inlet volume of the test point; carrying out steady-state simulation calculation on the test point bi, and obtaining the statistical average value Q2b of the simulation air inlet amount of the test point; at the moment, determining a precise relational expression; at the moment, re-planning the sampling point ai; importing the vehicle speed under the transient driving working condition into the determined accurate relational expression, and obtaining a relation curve of the air inlet amount of the cabin heat exchanger under the transient working condition, wherein the air inlet amount of the cabin heat exchanger comprises the air inlet quantity of a radiator and the air inlet quantity of a condenser; predicting transient driving conditions by discretizing a transient process into a plurality of steady-state calculation processes.

Description

technical field [0001] The invention relates to a simulation calculation method for the air intake volume of a heat exchanger in a cabin under transient driving conditions, and belongs to the field of automobile heat management. Background technique [0002] Under transient driving conditions, the continuous change of vehicle speed over time brings about continuous changes in the air intake of the heat exchanger module. For conventional transient calculations, the total duration needs to be discretized into multiple physical durations, and multiple iteration steps need to be set within each physical duration. Taking the total duration of the working condition as 1800s as an example, the time step is usually 3e-4s (calculated as the Courant number is 1), the number of inner iteration steps is 50, and 256 cores are used for parallel computing, and the calculation time of each step is about 6s , the total calculation time is 1.8e9s, which is 20833 days. Obviously, simulation ...

AI Technical Summary

Problems solved by technology

Therefore, the present invention aims to solve the problem that the simulation of the air intake volume of the heat exchanger module under transient driving conditions has a large amount of calculation, high cost, and a long cycle, and cannot provide the input of the air intake volume of the heat exchanger module for the one-dimensional simulation of thermal management performance.

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