循环曝气压力与活性剂浓度对滴灌带水气传输的影响

适宜的工作压力及表面活性剂浓度对循环曝气效率的提高及地下滴灌水气传输优化具有重要意义。利用循环曝气系统，设置工作压力和活性剂浓度2因素3水平共9个曝气组合，每组均进行非曝气对照试验，分析曝气组合条件对掺气比例、氧传质效率、滴灌带水气传输均匀性的影响。结果表明：循环曝气条件下，不添加活性剂时，压力提高有利于掺气比例增加，添加后，趋势相反；压力一定时，掺气比例随活性剂浓度升高而增加；滴灌带出水均匀性和出气均匀度分别在95%和70%以上；活性剂浓度及压力对氧传质系数分别起到了促进和抑制作用，活性剂的添加大大缩短了曝气时间；掺气比例计算方法能够准确反映曝气滴灌系统中水气传输特性。研究结果对循环曝气滴灌...

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Bibliographic Details
Published in农业工程学报 Vol. 30; no. 22; pp. 63 - 69
Main Author 雷宏军 臧明 张振华 刘欢 刘智远 徐建新
Format Journal Article
LanguageChinese
Published 华北水利水电大学水利学院，郑州 450011 2014
河南省节水农业重点实验室，郑州 450045%鲁东大学地理与规划学院,烟台,264025
Subjects
压力
循环曝气
掺气比例
氧传质系数
水
水气传输
灌溉
循环曝气
oxygen mass transfer coefficient
掺气比例
pressure
氧传质系数
water
air-water transmission
灌溉
irrigation
水
cycle aerated
压力
水气传输
aerated concentration
Online AccessGet full text
ISSN1002-6819
DOI10.3969/j.issn.1002-6819.2014.22.008

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Summary:适宜的工作压力及表面活性剂浓度对循环曝气效率的提高及地下滴灌水气传输优化具有重要意义。利用循环曝气系统，设置工作压力和活性剂浓度2因素3水平共9个曝气组合，每组均进行非曝气对照试验，分析曝气组合条件对掺气比例、氧传质效率、滴灌带水气传输均匀性的影响。结果表明：循环曝气条件下，不添加活性剂时，压力提高有利于掺气比例增加，添加后，趋势相反；压力一定时，掺气比例随活性剂浓度升高而增加；滴灌带出水均匀性和出气均匀度分别在95%和70%以上；活性剂浓度及压力对氧传质系数分别起到了促进和抑制作用，活性剂的添加大大缩短了曝气时间；掺气比例计算方法能够准确反映曝气滴灌系统中水气传输特性。研究结果对循环曝气滴灌系统水气传输效率的提高及运行成本的降低有重要指导。
Bibliography:11-2047/S
irrigation;water;pressure;cycle aerated;air-water transmission;aerated concentration;oxygen mass transfer coefficient
Lei Hongjun, Zang Ming, Zhang Zhenhua, Liu Huan, Liu Zhiyuan, Xu Jianxin （1. School of Water Conservancy, North China University of Water Conservancy and Electric Power, Zhengzhou 450011, China; 2. Henan Key Laboratory of Water-Saving Agriculture, Zhengzhou 450045, China; 3. College of Geography and Planning of Ludong University, Yantai 264025, China）
Aerated subsurface drip irrigation （ASDI） refers to the irrigation with aerated water based on Venturi principle by the use of subsurface drip irrigation （SDI） system. ASDI provides a source of oxygen to root environment that may suffer from temporary hypoxia, and therefore unlocks yield potentials of crops. But the efficiency of ASDI is dependent on a number of factors. Among which, proper operating pressure and surfactant concentration are of great significance for aeration efficiency and the uniformity of air and water flow in the aerat
ISSN:1002-6819
DOI:10.3969/j.issn.1002-6819.2014.22.008