孔令阳，范兴科.文丘里施肥器喉部负压的影响因素分析[J].干旱地区农业研究,2013,31(6):78~82
文丘里施肥器喉部负压的影响因素分析
Analysis on the influencing factors of throat negative pressure for Venturi injector
  
DOI：10.7606/j.issn.1000-7601.2013.06.014
中文关键词:  文丘里施肥器  喉部负压  进口压力  出口压力  变化规律  影响因素
英文关键词:Venturi injector  throat negative pressure  inlet pressure  outlet pressure  change regularity, influencing factors
基金项目:国家高技术研究发展技术（863）“农作物水肥高效利用生理调控及施肥产品研制”（2011AA1005A4）
作者单位
孔令阳1,3，范兴科1,2* (1.中国科学院水利部水土保持研究所， 陕西 杨凌 712100； 2.西北农林科技大学， 陕西 杨凌 712100； 3.中国科学院大学， 北京 100049） 
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中文摘要:
      为了了解文丘里施肥器的工况特性，通过理论分析与试验测定，研究了进、出口压力，喉部水流流速和局部水头损失系数对喉部负压的影响及变化规律。喉部负压的变化随进口压力的增大呈负相关线性函数递减，当喉部负压降到最低值-0.09 MPa后，进口压力的增大将不再影响喉部负压变化；出口压力对水流通过喉部有阻滞作用，从而影响喉部负压的产生。出口压力越大，喉部负压的产生以及达到最小负压所需的进口压力越大；喉部水流流速对喉部负压的产生及变化与进口压力对其影响相似；对于不同的局部水头损失系数ξ1和ξ2，ξ值越大，喉部负压随进口压力的增大而降低的速度越缓慢，达到最小值-0.09 MPa时所需的进口压力越高。
英文摘要:
      In order to understand the characteristics of Venturi injector, this paper has researched the pressure of inlet and outlet, flow velocity of the throat, the influences and change regularity of the coefficient of local head loss to the throat negative pressure by the theoretical analysis a nd experimental measuring. The result showed that: The change of the throat negative pressure was submitted the decreasing negative linear correlation function, followed with increase of the inlet pressure. After the throat negative pressure decreased to the minimum value -0.09 MPa, the throat negative pressure will be no any impact by the inlet pressure increasing. There was some blocking function by outlet pressure to the throat water flow, so it will be influenced the generation of the throat negative pressure, the more outlet pressure, the more inlet pressure needed to produce the throat negative pressure and to reach the minimal negative pressure. The flow velocity of the throat to the production and change of the throat negative pressure was the similar effect as the inlet pressure. With regard to the different local water head loss coefficient as ξ1 and ξ2, the more of the ξ value, the slower of the reduced velocity as the throat negative pressure with the increase of the inlet pressure, the higher of the inlet pressure needed, when reached the minimal value of -0.09 MPa.
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