为掌握保鲜运输用超声波加湿流场的分布特性，本文针对压差原理的保鲜运输厢体结构，以脐橙为试验物料，建立厢体的1/4等比例三维紊流模型，借助有孔模型和组分传输模型，结合SIMPLE算法和壁面函数法，运用Fluent软件进行超声波加湿的数值模拟，分析了厢体内温湿度场的变化。模拟结果表明：采用超声波加湿可以在212 s内将厢体内的相对湿度自70%升高至90%；厢体内温度场和湿度场分布均匀，厢体内温差不超过1 ℃，相对湿度差小于3.5%；加湿过程对温度场的影响较小；货物表面的相对湿度差不超过3%；货物区水蒸气扩散较快。经试验验证，试验结果与模拟结果相吻合。该研究结果对于保鲜运输加湿装置的结构优化具有一定的参考价值。

To improve the cognition of humidity regulation characteristics, the flow field data of fresh-keeping environment when ultrasonic humidification device works were collected and resh-keeping transportation envelope based on the structure of differential pressure principle and equipped with oranges was studied. A three-dimensional turbulence model of 1/4 ratio envelope was established and numerical simulation of ultrasonic humidification is obtained using hole and component transmission models and fluent software, combined with SIMPLE algorithm with wall function method. The temperature and humidity changes in the compartment body were analyzed. The results showed that ultrasonic humidification could increase relative humidity from 70% to 90% in compartment body within 212 seconds. Temperature and humidity field distribution in compartment body was uniform while the difference of temperature was less than 1 ℃ and the difference of relative humidity was no more than 3.5%. The humidification process showed a little influence on temperature. The difference of relative humidity of different goods surface was less than 3% and water vapor in goods area diffused faster. Experimental validation showed that test results were in good agreement with simulation results. The results had a certain reference value for optimizing humidification of fresh-keeping transportation equipment.

现代农业产业技术体系建设专项资金（CARS-33-13）；国家自然科学基金项目（31101363）；广东省自然科学基金资助项目（S2012010010388）；国家科技支撑计划项目课题（2013BAD19B01）