气调运输车厢渗风对氧气体积分数的影响

Researching of Effects on the oxygen volume fraction of air infiltration in the compartment with controlled atmosphere transportation

在分析热压和风压作用下车厢渗风特性的基础上,研究了车厢渗风对车厢内氧气体积分数的影响,并进行了试验验证。研究结果表明:气调保鲜车厢的试验渗风量与理论渗风量基本相符,气调保鲜运输车厢渗风量模型具有一定的准确性;气调保鲜运输途中车厢渗风主要是由风压作用引起的,热压单独作用引起的渗风量较小,并且当车速越大时,热压作用对行驶过程中总渗风量的影响越小;气调保鲜车停车时车厢O_2体积分数上升较慢,运输中O_2体积分数上升较快,并且渗风量和车厢装载率越大O_2体积分数上升越快。

In order to master the changing regulations of oxygen volume fraction in the controlled atmosphere transportation compartments,the air infiltration characteristics caused by the thermal pressure and wind pressure were analyzed,and then the influences of air infiltration to the oxygen volume fraction was researched,and the verification experiment was also carried out.The results shown that the theoretical value and experimental value of oxygen volume fraction in the compartment were basically identical,which indicated that the model of air infiltration model was accurate.Air infiltration was mainly caused by wind pressure,and the air infiltration volume was very small when thermal pressure functioned independently.When the vehicle speed is bigger,the the influence of thermal pressure to the total air infiltration volume is smaller.The oxygen volume fraction was increased slowly when the vehicle was parked,and the oxygen volume fraction increased rapidly in the transport.What’s more,the more the air infiltration and loading rate,the faster the oxygen volume fraction increasing.This research provided a reference for optimizing the equipments of controlled atmosphere transportation.