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液氮充注氣調(diào)廂開門時O2體積分?jǐn)?shù)預(yù)測模型研究
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廣東省自然科學(xué)基金資助項(xiàng)目（S2012010010388）、廣州市科技計(jì)劃資助項(xiàng)目（2014J2200070）和廣東省科技計(jì)劃資助項(xiàng)目（2012B020313007）


Prediction Model of O2 Volume Fraction in Controlled Atmosphere Compartments by Liquid Nitrogen Injection during Door-opening
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    摘要:

    為掌握液氮充注氣調(diào)廂開門時廂內(nèi)O2體積分?jǐn)?shù)的變化規(guī)律,，在分析熱壓作用下氣調(diào)廂開門滲風(fēng)特性的基礎(chǔ)上,，建立了O2體積分?jǐn)?shù)預(yù)測模型，并進(jìn)行了試驗(yàn)驗(yàn)證,。研究結(jié)果表明：氣調(diào)廂開門期間,，開門時間越短則氣調(diào)廂內(nèi)外空氣交界面的平均溫度上升越快；在氣調(diào)廂內(nèi)相對濕度為90%~95%情況下,，氣調(diào)廂內(nèi)外空氣交界面的相對濕度在開門后60s內(nèi)即迅速上升至100%,，并且開門期間平均相對濕度均在97%以上；開門時氣調(diào)廂內(nèi)O2體積分?jǐn)?shù)上升速度隨著開門時間的延長而逐漸降低,，通過對比計(jì)算數(shù)據(jù)和試驗(yàn)數(shù)據(jù)發(fā)現(xiàn)氣調(diào)廂內(nèi)O2體積分?jǐn)?shù)試驗(yàn)值和理論值存在一定誤差，開門時間為3min以上時,，相對誤差均在10%以內(nèi),。

    Abstract:

    Studying the features of gas changes in controlled atmosphere compartment contributes to improve performance and promote the application of controlled atmosphere compartment. In order to obtain the changing regulations of oxygen volume fraction in the controlled atmosphere compartment by liquid nitrogen injection, the air infiltration characteristics under thermal pressure of compartment were analyzed, and then the predicting model of oxygen volume fraction in the compartment was established. Moreover, verification experiment was also carried out. Results indicate that during the door-opening, the shorter the door-opening time is, the faster the average temperature rises. The relative humidity quickly rises to 100% within 60s after opening the door on condition that the relative humidity in the compartments is 90%~95%, and the average relative humidity is more than 97% during door-opening. What’s more, the rising velocity of oxygen volume fraction gradually decreases with longer duration of door-opening, and there is certain error between experimental value and theoretical value of oxygen volume fraction based on theoretical calculation and experiment. However, the relative error between the experimental and theoretical value is within 10% when the door-opening time is more than 3min. This research provides a reference for predicting matching amount for liquid nitrogen and safety range of oxygen volume fraction for safe operation.

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楊松夏,呂恩利,陸華忠,呂盛坪,劉杰坤.液氮充注氣調(diào)廂開門時O2體積分?jǐn)?shù)預(yù)測模型研究[J].農(nóng)業(yè)機(jī)械學(xué)報,2015,46(3):223-227. Yang Songxia, Lü Enli, Lu Huazhong, Lü Shengping, Liu Jiekun. Prediction Model of O2 Volume Fraction in Controlled Atmosphere Compartments by Liquid Nitrogen Injection during Door-opening[J]. Transactions of the Chinese Society for Agricultural Machinery,2015,46(3):223-227.

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  • 收稿日期:2014-07-28
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  • 在線發(fā)布日期: 2015-03-10
  • 出版日期: 2015-03-10
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