Study On The Effect Of Non-compensated Trickle Emitter Manufacturing Deviation On The Technial Index Of Field Pipe Network

Emitter manufacture deviation affect the irrigation uniformity of field pipe network, but the present of hydraulic design calculation less consider this question in the field pipe network, so it lead to exist bias between design and practical operation. Based on laboratory test and theoretical analysis, numerical simulation method, the combination of the system are analyzed non-compensated of emitter manufacturing deviations, and the influence of technical indexes for drip irrigation system design and operation management theory are offered, the main research results are as follows:(1) In the hydraulic characteristics of emitter laboratory test, analysis of experimental data, based on the inadequate of flow deviation rates as the emitter manufacture deviation, the emitter manufacture deviation are redefined. Analysis of emitter flow, emitter manufacture deviation, flow index, flow coefficients obey the normal distribution. Base on the random variable of flow index and flow coefficient to computer simulation about the emitter flow, through the two random simulation results verified the results accord with the requirement, the simulation results are in good agreement with the experimental results.(2)As consideration of emitter manufacture deviation, the numerical simulation model of drip irrigation lateral hydraulic calculation which use MATLAB programming are established. Through using the model, the variation of lateral hydraulic factors under different conditions could be analysed, the results showed that the change rule which consider emitter manufacture deviation and does not consider emitter manufacture deviation, the lateral pressure and discharge rate will have certain fluctuation, and emitter flow volatility is obvious.(3) As consideration of emitter manufacture deviation, the model of field pipe network numerical simulation which use MATLAB programming are established. The model was applied to the analysis of different factors, the process of water under the condition of the pipeline system pressure, flow rate deviation head deviation and pipeline irrigation uniformity coefficient of variation. Results show that the pressure head, flow rate deviation error rate, irrigation evenness change trend and does not consider emitter manufacture deviation affect overall trend when is close, but the deviation emitter manufacturing network technology index, the influence of water quality decreased obviously, pressure, flow rate deviation head emitter along with deviation ratio of manufacture deviation coefficient increases, irrigation uniformity coefficient of emitter along with the manufacturing error decreases. In consideration of emitter manufacture deviation, on the basis of the influence of pressure head deviation ratio and drip irrigation flow rate deviation between the empirical formula was revised, significant test shows that formula is feasible.