『Calculation formula for nozzle flow rate』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
1. Calculation formula for turbine nozzle flow rate
The core of calculating turbine nozzle flow rate is to distinguish between critical and non critical flow states, and their formulas and application conditions are different. 1. The formula for the critical flow rate of an ideal gas in a tapered nozzle is that when the ratio of the outlet pressure to the inlet stagnation pressure difference is less than or equal to the critical pressure ratio, the flow reaches a critical state. At this point, the flow rate is the critical flow rate and the maximum value of the pressure drop is obtained. The calculation formula is:$ G_{cr}=A_{cr} \sqrt{\frac{2\kappa}{\kappa + 1}(\frac{2}{\kappa + 1})^{\frac{2}{\kappa - 1}} \frac{p_0}{\upsilon_0}}$ In the formula: • $A_ {cr} $: the minimum cross-sectional area of the nozzle throat, measured in $m ^ 2 $; $\ kappa $: The isentropic index (adiabatic index) is approximately 1.3 for superheated steam and 1.135 for saturated steam; $p0 $: stagnation pressure of steam at the nozzle inlet, in $Pa $; $\ upsilon0 $: The stagnation ratio volume of steam at the inlet of the nozzle, measured in $m ^ 3/kg $
2. The formula for the flow rate of a converging nozzle under non critical conditions. When the outlet pressure of the nozzle is higher than the critical pressure, the flow is in a subcritical state and the flow rate is lower than the critical flow rate. The calculation formula is:$ G = A \sqrt{\frac{2\kappa}{\kappa - 1}\frac{p_0}{\upsilon_0}[(\frac{p_1}{p_0})^{\frac{2}{\kappa}} - (\frac{p_1}{p_0})^{\frac{\kappa + 1}{\kappa}}]}$ In the formula: • $A $: nozzle outlet cross-sectional area, unit: $m ^ 2 $; $p1 $: The static pressure of the steam at the nozzle outlet, measured in $Pa $;
2. How to calculate the flow rate of the nozzle?
The nozzle flow rate is represented by q, q=K√10P。 P - The working pressure of the water mist nozzle is MPa. K - Flow coefficient of water mist nozzle, provided by the manufacturer. Fire sprinkler pump and fire booster pump shall be determined according to the actual situation of use. The pump type used is similar to that of the fire protection system, but the head and flow rate are different. Fire pumps are mainly divided into vertical fire pumps and horizontal fire pumps. The flow rate of the transported liquid is one of the important performance data for selecting fire pumps, and the flow rate of the transported liquid directly affects the production capacity of the entire device. Extended information: There are two types of nozzles:
I. Burner nozzles (military, civil)
II. Non burner nozzles can be roughly divided into spray nozzles, oil spray nozzles, sandblasting nozzles, garden greening irrigation nozzles, rocker arm nozzles for agricultural field irrigation, agricultural greenhouse micro nozzles, industrial dust-proof nozzles and special nozzles according to their functions. According to the material selection, it can be classified into metal spray nozzles, plastic nozzles, ceramic nozzles, and alloy no
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