ATP文丘里施肥器喉管结构优化与流场计算

doi:10.3969/j.issn.1674-8530.18.1024

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Abstract In order to verify the correction of throat-to-outlet diameter ratio of nozzles, and clarify the superiority of the Venturi with this ratio and its related parameters variation rule further, software SolidWorks was used to generate 8 different Venturi 3D models, and a CFD software was launched to calculate fluid flows through them. The variation rules of pressure difference, Reynolds number, fertilizer suction flow rate, and minimum pressure were obtained, and the influences of λ on flow field characteristics under the same working condition were analyzed. The results show that the optimal λ simulated is different from that in literature by 8.6% and the error in the inlet flow rate between prediction and experiment is around 10%. The pressure difference varies with Reynolds number in terms of power function, but with minimum pressure linearly. The necessary conditions for a negative pressure in this series of fertilizer are obtained. The differential pressure for a negative pressure, p_ini, is 4.3 kPa when λ =1.27. p_ini decreases with increasing λ if 1.00≤λ<1.27. While p_ini increases with increasing λ but also shows a gradually increasing trend when 1.27≤λ<1.68. Pinitial decreases with increasing λ once more when 1.68≤λ<2.00. According to the calculated results, the flow field in the symmetrical plane of Venturis is analyzed and confirms that the suction performance of the Venturi with λ=1.27 is better than the other fertilizer applicators. Since λ=1.27 means a Venturi to be reliable, it should be the optimal value of λ for ATP 3, 4, 5, 6 series fertilizer applicators. 

Key words： Venturi fertilizer applicator throat absorbing fertilizer consumption inlet flow rate negative pressure

Received: 10 April 2018

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	WANG Qiu-Liang-
	WANG Zhen-Hua-^*
	WU Wen-Yong-
	LIAO Ren-Kuan-

Cite this article:

WANG Qiu-Liang-,WANG Zhen-Hua-^*,WU Wen-Yong-等. Throat structure optimization and flow field analysis of ATP Venturi fertilizer applicators[J]. Journal of Drainage and Irrigation Machinery Engin, 2018, 36(9): 829-834.

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http://zzs.ujs.edu.cn/pgjx/EN/10.3969/j.issn.1674-8530.18.1024 OR http://zzs.ujs.edu.cn/pgjx/EN/Y2018/V36/I9/829

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