Research On Simulation And Optimization Of Engineering Vehicle Refrigeration

The engineering vehicles play an irreplaceable role in Chinese infrastructure construction, such as western development, urbanization, the building of highway network. The higher requirements on engineering vehicles driving comfort are put forward as the increase of the number of engineering vehicle. Based on the analysis of driver comfort, through the numerical simulation to study the engineering vehicle cab.It has an important significance for the improvement of engineering vehicle cab comfort.Taking a large excavator cab as the research object, established three-dimensional models for engineering vehicle cab, the numerically simulation of indoor air distribution were carried on under the condition of different air supply outlet position, different air supply temperature and different air supply velocity by using Fluent software. On the basis of numerical simulation, the influence law of cab drivers and various parts of cab drivers’ body were analyzed on the different air supply position, air supply temperature and air supply speed. Then the evaluation parameters, such as uneven temperature coefficient, velocity uniformity coefficient and air distribution performance index were used to evaluate the driver’s comfort level in different air supply conditions. The follow conclusions were drawn through the analysis of numerical simulation and the driver comfort. The air supply outlet position affects the temperature field and velocity field, and then affects the driving comfort.When indoor air flowed fully, The air supply outlet position has little impact on the average indoor temperature.The supply air temperature significantly impacts on the temperature value and distribution of temperature and velocity. At the same time, supply air temperature slightly affects velocity value.Air velocity minimum should make driving indoor air sufficient liquidity to meet the comfort requirements. The two working conditions, fifth working condition,ceiling air supply,292 K air temperature,4m/s air speed,and the fourteenth workingcondition, sidewall sir supply,292 K air temperature,4m/s air speed,are the best conditions to meet the driver’s comfort. Finally, from the improvement of engineering vehicle cab refrigeration effect angle, the situation of head and foot are easily affected by the location of the outlet in the side-wall outlet form and the wind speed value is too big.It will be appropriate to change the wind direction side wall air outlet and decrease fixed air outlet wind speed value to improve the comfort degree.The high wind speed value and low temperature of driver’s foot badly hurt the comfort of driver because of the outlet location in the floor air supply form.It will be appropriate to move the outlet location and adjust the direction of sir supply.The simulation research of engineering vehicles refrigeration system in driving indoor airflow organization provides the basis for design and improvement on engineering vehicles refrigeration system.