中文摘要：

为了研究果蔬的形状、大小和密度对环形射流泵输送性能的影响,该文采用喉管直径为60 mm的环形射流泵进行了马铃薯、胡萝卜、圣女果和金桔的输送试验,对入口结构、流量比、输送高度和果蔬种类4个因素对输送性能的影响进行了研究,并分析了不同工况对果蔬损伤的影响。结果表明：吸入口结构对输送性能有很大的影响;该环形射流泵输送马铃薯、胡萝卜、圣女果和金桔的最高输送能力分别为3 038.13、2 158.83、2 302.92和1 949.50 kg/h;在相同的面积比和输送高度下,输送能力随工作流体流量的增加而增大;在相同的面积比和工作流体流量下,输送能力随输送高度的升高而降低;在相同的工况下,输送椭球形的果蔬的能力要优于输送长条形果蔬的能力,输送密度较大的果蔬的能力要优于输送密度较小的果蔬的能力。输送单位质量果蔬的能耗在低流量比时变化不明显,在高流量比时有较大提升。马铃薯和胡萝卜在输送过程中损伤很小,损伤原因是与管道或泵内壁或者管道接口处碰撞,马铃薯和胡萝卜的最大质量损失率分别为0.13%和0.21%,最大表面损失率为0.68%和1.20%,圣女果和金桔在所有工况没有损伤。该研究可为今后环形射流泵输送果蔬的深入研究提供参考。

英文摘要：

With the development of agricultural industry, the requirement of fruits and vegetables conveying is increasing, the traditional way of gradually conveying fruits and vegetables cannot satisfy demand. As a result, the improvement or innovation of the way of fruits and vegetables conveying is particularly important. Compared with the traditional way of fruits and vegetables conveying, the use of annular jet pump（AJP） for fruit and vegetable conveying have the advantages of nondestructive, reliable, fast and strong adaptability, etc. In this study, we conducted experiments to search the performance of annular jet pump with the throat diameter of 60 mm and area ratio in 1.75 and 3 to measure its transmission capacity for transporting different fruits and vegetables（potato, carrot, cherry tomato and kumquat） under different conditions. We also analyzed the effect of various factors（flow, head, and fruit and vegetable species） on the transmission capacity, recorded and analyzed the damage in the process of conveying fruits and vegetables. Considering the characteristics of the fruits and vegetables conveying, a conical net tube was used to centralize fruits and vegetables with extremely low possibility of mechanical damage and the lift of AJP was used to control the outlet pressure instead of the outlet tube valve, which avoided potential mechanical damage on fruits and vegetables. Based on the experiments, we demonstrated the impacts of flow ratio and the lift of AJP, as well as different fruits and vegetables on the capacity in fruits and vegetables conveying. The experimental results show that： 1） the maximum transmission capacity of potato, carrot, cherry tomato and kumquat were 3 038.13, 2 158.83, 2 302.92, 1 949.50 kg/h, respectively. The performance of transmission capacity of four fruits and vegetables changes with flow ratio was similar. The transmission capacity increased with the increase of flow ratio under the same area ratio and lift of AJP because the secondary flow rate increased and pr