Research on quantitative design of discharges for trapezoidal-channel emitters

Stereolithography technology was used to fabricate experimental samples of emitters, and the experiments of emitter hydraulic performance were carried out with uniform design method, where six key parameters of trapezoidal-channel emitter were distinguished. The discharge coefficient and the flow exponent were regressed respectively, the results show that power function model is more appropriate for the relationship between the discharge coefficient and six parameters, while the flow exponent can be well expressed by a second-order polynomial model, which are verified by the experimental data of another three groups emitters. The regression model appears to be a good empirical formula for the quantitative design of emitters' discharges.