5 results about "Discharge coefficient" patented technology

The invention provides a method for correcting the outflow coefficient of a sonic nozzle and a method for correcting the flow of gas flowing out of the sonic nozzle, and belongs to the technical field of metrology. The method for correcting the outflow coefficient of the sonic nozzle comprises the steps that according to Reynolds number traceability calculation values under different stagnation conditions, a theoretical calculation value during outflow coefficient traceability is obtained; according to the outflow coefficient traceability value, the Reynolds number traceability calculation value and the outflow coefficient traceability theoretical calculation value under different stagnation conditions, obtaining a correction relationship among the Reynolds number traceability calculation value, the outflow coefficient traceability value and the outflow coefficient traceability theoretical calculation value under any stagnation condition during traceability; and according to the Reynolds number calculation value, the outflow coefficient theoretical calculation value and the correction relation under any stagnation condition during actual measurement, an outflow coefficient correction value under any stagnation condition during actual measurement is obtained. The method for correcting the outflow coefficient of the sonic nozzle is not limited by the Reynolds number, and the outflow coefficient of the small-throat-diameter sonic nozzle under different stagnation conditions can be accurately calculated.

A method of operating a rotating detonation combustor (104, 104', 108, 108', 114, 114') includes providing (S702) a flow of air (80, 98) through an air inlet (154, 154') to flow into a detonation chamber (128), providing (S703) a flow of fuel (68, 102) from at least one fuel injector (160, 160') into the detonation chamber (128), mixing (S704) the flow of the fuel (68, 102) and the flow of the air (80, 98) in the detonation chamber (128) to generate a fuel-air mixture (111), detonating (S705) the fuel-air mixture (111) in the detonation chamber (128) to generate rotating detonation waves (106, 112) within the detonation chamber (128), and controlling (S706-S715), during operation of the rotating detonation combustor (104, 104', 108, 108', 114, 114') from a first power operating state to a second power operating state, different from the first power operating state, the air inlet wall (164, 164') to control the flow of the air (80, 98) through the air inlet (154, 154') into the detonation chamber (128) to control a discharge coefficient and an operating mode within the detonation chamber (128).

The invention discloses a natural gas critical flow venturi nozzle outflow coefficient fitting method. The method comprises the following steps: collecting gas related information of a mass-time method primary standard test pipeline under different pressure conditions; calculating outflow coefficients and Reynolds numbers under different pressure conditions; determining outflow coefficient correction parameters under different pressure conditions by using the gas related information, the outflow coefficient and the Reynolds number under different pressure conditions, and establishing a mapping relationship among the gas pressure-Reynolds number-outflow coefficient correction parameters under different pressure conditions; and the gas pressure information and the gas Reynolds number are substituted into the mapping relation, outflow coefficient correction parameters are determined, and the fitted critical flow Venturi nozzle outflow coefficient is obtained. According to the method, the outflow coefficients of the critical flow venturi nozzle can be fitted under different gas pressure conditions, accurate metering of the critical flow venturi nozzle under different pressure conditions is achieved, fairness and justice of field trade are guaranteed, and accuracy and consistency of natural gas flow measurement values can be improved.

A multi-objective optimization design method for multi-parameter balanced flowmeters based on a matrix structure belongs to the field of flow detection technology. The method employs a variable concentric layer structure of up to five layers to construct an initial parameter variable matrix, parameterizing the orifice plate for CFD mesh generation. The CFD calculation module calculates the objective functions of permanent pressure loss and velocity uniformity at a given cross-section. An optimized orifice plate structure is generated through a multi-objective, multi-parameter optimizer, coupled with the CFD calculation module to achieve optimal loss reduction and flow field uniformity. The design module receives the optimal orifice shape and constructs the instrument coefficient correlation and initial values; the CFD calculation module performs variable Reynolds number calculations; based on the initial instrument coefficient correlation, the design module performs nonlinear regression to obtain an empirical correlation between the discharge coefficient and the Reynolds number and orifice shape, outputting the instrument coefficient and completing the optimization design. This design, through multi-objective structural optimization, achieves accurate output of the discharge coefficient and instrument coefficient for any multi-orifice flowmeter, improving the accuracy and adaptability of the balanced flowmeter in real-world conditions.

The present disclosure relates to a liquid level control method, device, controller and readable storage medium, the method comprising: when a glass liquid level distortion is detected, obtaining an actual discharge amount of a glass production system; obtaining a target charging amount according to the actual discharge amount and a discharge coefficient, the discharge coefficient representing a ratio of the discharge amount to the charging amount of the glass production system when the glass liquid level is normal; obtaining an actual charging amount of the glass production system, and obtaining a charging deviation value according to the target charging amount and the actual charging amount; and adjusting the actual charging amount of the next time according to the charging deviation value and the actual charging amount, so as to maintain the liquid level stability in the glass production process. In this way, in the case of glass liquid level distortion, the target charging amount is obtained according to the actual discharge amount and the discharge coefficient representing the normal glass liquid level, and the actual charging amount of the next time is adjusted according to the target charging amount and the actual charging amount, so as to avoid the liquid level from changing greatly, thereby ensuring the liquid level stability in the glass production process.