CN113218479A - Deviation rectifying method for nozzle flow formula - Google Patents
Deviation rectifying method for nozzle flow formula Download PDFInfo
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- CN113218479A CN113218479A CN202110559940.4A CN202110559940A CN113218479A CN 113218479 A CN113218479 A CN 113218479A CN 202110559940 A CN202110559940 A CN 202110559940A CN 113218479 A CN113218479 A CN 113218479A
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000012530 fluid Substances 0.000 claims abstract description 9
- 238000012937 correction Methods 0.000 claims abstract description 8
- 230000000704 physical effect Effects 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
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- 235000013399 edible fruits Nutrition 0.000 description 1
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- 238000005259 measurement Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/02—Compensating or correcting for variations in pressure, density or temperature
- G01F15/022—Compensating or correcting for variations in pressure, density or temperature using electrical means
- G01F15/024—Compensating or correcting for variations in pressure, density or temperature using electrical means involving digital counting
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Abstract
The invention relates to the technical field of nozzle flow, in particular to a deviation rectifying method of a nozzle flow formula; in actual operation, the flow coefficient C of the nozzle is related to the Re of the fluid instead of being constant to 1, so that the actual flow coefficient C value is obtained, and then the density correction coefficient is also added. And correcting the flow under the working condition that the temperature is not 20 ℃ so as to be closer to the actual flow.
Description
Technical Field
The invention relates to the technical field of nozzle flow, in particular to a deviation rectifying method of a nozzle flow formula.
Background
The nozzle is manufactured by using national standard GB/T2624.3-2006 orifice plate for flow measurement throttling device, nozzle and Venturi tube to measure the fluid flow of a filled round tube, and equivalently adopts international standard ISO 5167-3: 2003-part 3 of measuring the full-tube fluid flow by using a differential pressure device installed in a round-section pipeline: nozzles and venturi nozzles, the present standard also conforming to the society of heating, air conditioning and refrigeration engineers and the american society of air flow and conditioning standards. The nozzle is in the form of a long-diameter low-ratio nozzle (D/D is not less than 0.20 and not more than 0.50, D is the diameter of the throat of the nozzle, and D is the inner diameter of the upstream pipeline) specified in the above standard.
However, in the existing nozzle flow statistical method, the default value of C is 1, and a certain density variable exists when the temperature T is not equal to 20 ℃, so that certain data deviation occurs in the finally counted nozzle flow, and the accuracy of experimental data is affected.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a deviation rectifying method of a nozzle flow formula aiming at the technical defects, wherein in the actual operation, the flow coefficient C of a nozzle is related to the Re of a fluid instead of being constant to be 1, so that the actual flow coefficient C value is obtained, and then a density correction coefficient is also added. And correcting the flow under the working condition that the temperature is not 20 ℃ so as to be closer to the actual flow.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: comprises the following steps of (a) carrying out,
s1, selecting physical property parameters at T =20 ℃;
s2, DN110 is 513-. We also thin a part by taking a part from 500m to 1200m, according to the previously used range;
s3, carrying out tophance at the flow rate range of 600 m/h-1200 m, carrying out tophance at intervals of 10 m/h, and carrying out tophance at the interval of 71;
s4, the throat Red of the nozzle is calculated according to each flow, and the flow coefficient C under the corresponding flow is obtained by using the relation between the flow coefficient C and Re in the specification.
S5, according to
And obtaining the pressure difference delta P corresponding to each flow. (ii) a
S6, 71 points (Q, Δ P), were fit to the formula y =42.393 × X0.504；
And S7, increasing the density correction coefficient K. The formula becomes y = 42.393K X0.504。
Further optimizing the technical scheme, the formula of the flow coefficient C in the step S4 is C =0.9986-
+
。
Further optimizing the technical scheme, Q in the step S5 is the flow rate (m) of the fluid passing through the nozzle3C is the nozzle flow coefficient, A is the nozzle throat area (m)2) Δ p is a static pressure difference (Pa) between the front and rear of the nozzle, and ρ is a fluid density (kg/m) at the throat of the nozzle3）。
Further optimizing the technical scheme, wherein K = in the step of S7
,
Is a gas density at 20 c and,
is the gas density at any temperature.
Compared with the prior art, the invention has the following advantages: 1. the flow calculation is more accurate, and the applicability is wider; 2. consider that in actual operation, the flow coefficient of the nozzle is related to the Re of the fluid rather than being constant at 1; 3. the density correction factor is increased. And correcting the flow under the working condition that the temperature is not 20 ℃ so as to be closer to the actual flow.
Drawings
FIG. 1 is a schematic diagram of a nozzle structure of a deviation rectifying method of a nozzle flow formula.
FIG. 2 is a nozzle technical data table of a deviation correction method of a nozzle flow formula.
FIG. 3 is a table of nozzle flow coefficients for a method of correcting the deviation of a nozzle flow equation.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Example 1
S1, selecting physical property parameters at T =20 ℃;
s2, DN110 is 513-. We also thin a part by taking a part from 500m to 1200m, according to the previously used range;
s3, carrying out tophance at the flow rate range of 600 m/h-1200 m, carrying out tophance at intervals of 10 m/h, and carrying out tophance at the interval of 71;
s4, the throat Red of the nozzle is calculated according to each flow, and the flow coefficient C under the corresponding flow is obtained by using the relation between the flow coefficient C and Re in the specification.
S5, according to
And obtaining the pressure difference delta P corresponding to each flow. (ii) a
S6, 71 points (Q, Δ P), were fit to the formula y =42.393 × X0.504；
And S7, increasing the density correction coefficient K. The formula becomes y = 42.393K X0.504。
Comparative example
S1, selecting physical parameters at 20 ℃;
s2, DN110 is 513-. The selection interval is 500m for carrying out the high-speed cultivation/h-1200 m for carrying out the high-speed cultivation;
s3, carrying out dry top-down cultivation in the air volume range of 500 m/h-1200 m, wherein the number of the dry top-down cultivation steps is 25;
s4, according to the formula
The value of the middle C is 1, and the corresponding pressure difference delta P is calculated by using the formula;
s5, fitting the 25 points (Q,. DELTA.P) into a form of power. Obtaining a flow calculation formula: q = 44.145X0.5。
Taking the DN110 nozzle as an example:
if the experiment was carried out, the temperature of the tank was 25 ℃, the differential pressure Δ P read by the pressure sensor =735 pa; according to the calculation formula of other test beds, calculating the flow rate of Q =1197m for carrying out the year/h; we revised the formula, calculated flow rate Q =1187.6 m and difference Δ Q =9.248m for thin fruit trees/h.
Comparing example 1 with the comparative example, it can be seen that in this example 1, the actual relationship between C and Re is determined by searching the specification, instead of directly defaulting to 1, and then the density correction coefficient is also increased, so that the accuracy of flow calculation in the environment where the temperature T ≠ 20 ℃ is applicable.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (4)
1. A deviation rectifying method for a nozzle flow formula is characterized in that: comprises the following steps of (a) carrying out,
s1, selecting physical property parameters at T =20 ℃;
s2, carrying out DN110 at 513 and 1197 m/h according to the nozzle flow range given by the Aikang nozzle technical data table;
s3, following a previous speed of 500 m/h-1200 m, carrying out a top-down shift at a flow rate range of 600 m/h-1200 m, thinning the step length, at intervals of 10 m/h, for a total of 71;
s4, calculating the throat Re of the nozzle according to each flowdAnd calculating the flow coefficient C under the corresponding flow by using the relation between the flow coefficient C and Re in the standard.
S5, according to
Obtaining the pressure difference delta P corresponding to each flow;
s6, 71 points (Q, Δ P), were fit to the formula y =42.393 × X0.504；
S7, increasing the density correction coefficient K, wherein the formula is changed into y = 42.393K X0.504。
2. The method of claim 1, wherein the deviation of the nozzle flow formula is determined by: the formula of the flow coefficient C in the step S4 is C =0.9986-
+
。
3. The method of claim 1, wherein the deviation of the nozzle flow formula is determined by: q in the step S5 is the flow rate (m) of the fluid passing through the nozzle3C is the nozzle flow coefficient, A is the nozzle throat area (m)2) Δ p is a static pressure difference (Pa) between the front and rear of the nozzle, and ρ is a fluid density (kg/m) at the throat of the nozzle3）。
4. The method of claim 1, wherein the deviation of the nozzle flow formula is determined by: k = in the step of S7
,
Is a gas density at 20 c and,
is the gas density at any temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110559940.4A CN113218479A (en) | 2021-06-26 | 2021-06-26 | Deviation rectifying method for nozzle flow formula |
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2021
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Application publication date: 20210806 |