A method for calculating the pressure loss of the inlet and outlet of the converging tee cavity

Abstract

The invention relates to the technical field of fluid pressure loss, and discloses a method for calculating the pressure loss of an inlet and outlet of a converging tee cavity. The method comprises the following steps: 1. setting a right-angle converging state and a flat-angle converging state; 2. dividing the converging tee cavity into two imaginary first and second sub-cavities; 3. calculating the pressure loss of the two imaginary sub-cavities at a sudden expansion point; 4. calculating the pressure loss of the two imaginary sub-cavities caused by fluid turning; 5. obtaining the uncorrected total pressure loss; 6. obtaining the corrected (flat-angle state) total pressure loss; 6. substituting a flat-angle and right-angle conversion correction coefficient to obtain the corrected total pressure loss in the right-angle state. The method can effectively predict the pressure loss between the outlet and the inlet of the converging tee cavity, and has good accuracy within a considerable range. In addition, a calculation formula is used to describe the pressure loss in the converging tee cavity at a theoretical level, and the changing law of the pressure loss in the converging tee cavity can be effectively reflected.

Description

Technical Field

[0001] The invention belongs to the technical field of fluid pressure loss, and in particular relates to a method for calculating the pressure loss of an inlet and outlet of a converging tee cavity. Background Art

[0002] With the continuous improvement of cavity floor smoke exhaust technology, various types of smoke exhaust cavities or other fluid flow cavities have appeared in the technology. Due to the complexity of the cavity, it is difficult for conventional calculation methods to calculate the pressure loss of complex cavities, resulting in the cavity floor smoke exhaust or fluid flow system being highly dependent on numerical software and unable to effectively reflect the changing law of fluid pressure loss in the cavity. Summary of the invention

[0003] In view of the deficiencies in the prior art, an object of the present invention is to provide a method for calculating the pressure loss at the inlet and outlet of a converging tee cavity, so as to solve the above-mentioned problems.

[0004] A method for calculating the pressure loss of the inlet and outlet of the converging tee cavity, the calculation steps are as follows:

[0005] Step 1, assuming that the converging tee cavity is a cubic structure, any three sides of the converging tee cavity are respectively provided with a first port, a second port and a third port, the angle between the first port and the second port is a right angle, and the angles between the third port and the first port and the second port are all right angles, and the fluid flowing out of the converging tee cavity from different pipes is divided into a right-angle converging tee cavity state or a right-angle converging tee cavity state, wherein the fluid converging from the first port or the third port belongs to the right-angle converging tee cavity state, and the fluid converging from the second port or the third port belongs to the right-angle converging tee cavity state;

[0006] Step 2, calculating the pressure loss of the converging tee cavity, firstly divide the tee cavity into two imaginary first sub-cavities and second sub-cavities with the second port as the midpoint;

[0007] Step 3, using standard fluid mechanics formulas to calculate the pressure losses of the two imaginary cavities at the sudden expansion points;

[0008] Step 4, using the difference principle, respectively calculate the pressure loss of the two imaginary cavities caused by the fluid turning;

[0009] Step 5, obtaining the uncorrected total pressure loss of the first sub-cavity and the uncorrected total pressure loss of the second sub-cavity;

[0010] Step 6, substituting the pressure loss correction coefficient of the converging tee into the corrected total pressure loss of the first sub-cavity and the corrected total pressure loss of the second sub-cavity, that is, the corrected total pressure loss of the first sub-cavity and the corrected total pressure loss of the second sub-cavity in the right-angle converging tee cavity state;

[0011] Step 7, substitute the total pressure loss obtained in step 6 into the conversion correction coefficient of the straight angle and right angle converging tee cavity to obtain the corrected total pressure loss of the first sub-cavity and the corrected total pressure loss of the second sub-cavity in the right angle converging tee cavity state.

[0012] Further, the first port, the second port and the third port each represent a collection of multiple pipes.

[0013] Further, in step 3, the expression for the pressure loss at the sudden expansion of the first imaginary cavity is:

[0014]

[0015] The expression for the pressure loss at the sudden expansion of the second imaginary cavity is:

[0016]

[0017] in, ΔP' tp(ex)1 Define the pressure loss at the first imaginary cavity expansion, ΔP' tp(ex)2 Define the pressure loss at the sudden expansion of the second imaginary cavity; α ex is the local resistance coefficient at the sudden expansion; n ex is the number of pipes installed at the fluid inlet port, is the correction coefficient, ρ is the fluid density, g is the gravitational acceleration, u tp1 is the average flow velocity of the fluid in a single pipe at the first port, u tp2 is the average flow velocity of the fluid in a single pipe of the second port, A1 is the isovelocity equivalent circular area of ​​the first imaginary sub-cavity end face connected to the first port or the isovelocity equivalent circular area of ​​the second imaginary sub-cavity end face connected to the second port, A2 is the isovelocity equivalent circular area of ​​a single pipe in the first port or the second port, and tp is an identifier.

[0018] Further, in step 4, the expression for the pressure loss of the first imaginary cavity caused by the fluid turning is:

[0019]

[0020] The expression of the pressure loss caused by the fluid turning in the second imaginary cavity is:

[0021]

[0022] Where ΔP' tp(bd)1 is the pressure loss at the corner of unequal cross-section of the first port, ΔP' tp(bd)2 is the pressure loss at the unequal cross-section corner of the second port, ΔP' tp(bd)11The pressure loss of the equal cross-section bend calculated from the equal flow velocity equivalent area of ​​the total cross-sectional area of ​​the first port, ΔP' tp(bd)12 When the pressure loss of the first port is calculated as the pressure loss of the equal cross-section bend by using the equal flow velocity equivalent area of ​​half the total area of ​​the outflow end, ΔP' tp(bd)21 The pressure loss of the equal cross-section bend calculated from the equal flow velocity equivalent area of ​​the total cross-sectional area of ​​the second port, ΔP' tp(bd)22 When it is the pressure loss of the second port, the pressure loss of the equal-section bend is calculated by using the equal-flow velocity equivalent area of ​​half the total area of ​​the outflow end, and bd is the identifier.

[0023] Further, in step 5, the expression of the uncorrected total pressure loss of the first hypothetical sub-cavity is:

[0024] ΔP' tp1 =ΔP' tp(ex)1 +ΔP' tp(bd)1 ;

[0025] The expression for the uncorrected total pressure loss of the second hypothetical sub-cavity is:

[0026] ΔP' tp2 =ΔP' tp(ex)2 +ΔP' tp(bd)2 ;

[0027] Where ΔP' tp1 is the uncorrected total pressure loss at the second port, ΔP' tp2 is the uncorrected total pressure loss at the second port.

[0028] Furthermore, in step 6, the corrected total pressure loss expression of the first cavity is:

[0029]

[0030] The corrected total pressure loss expression of the second cavity is:

[0031]

[0032] Among them, ΔP tp1 is the corrected total pressure loss at the first port, ΔP tp2 is the total pressure loss after correction at the second port, α tp1 is the first port pressure loss correction coefficient, α tp2 is the pressure loss correction factor of the second port.

[0033] Further, in step 7, the corrected total pressure loss expression of the first sub-cavity in the converging three-way cavity state is:

[0034] ΔP tpa直 =ΔP tp1 αtpa1 ;

[0035] The corrected total pressure loss expression of the second cavity in the converging three-way cavity state is:

[0036] ΔP tpa角 =ΔP tp2 α tpa2 ;

[0037] Among them, α tpa1 is the pressure loss correction factor of the first port, α tpa2 is the pressure loss correction factor of the second port.

[0038] Compared with the prior art, the advantages of the present invention are as follows:

[0039] The present invention divides the existing converging tee cavity equally and calculates the pressure loss of the sub-cavities respectively, performs coupling correction on the pressure loss of the sub-cavities, effectively predicts the pressure loss between the outlet and inlet ends of the converging tee cavity, and reflects the changing law of the pressure loss of the converging tee cavity. Compared with the existing experimental results, the present invention has good accuracy within a considerable range and can describe the pressure loss behavior of the converging tee cavity at the theoretical formula level. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic diagram of the cavity state of a straight-angle converging tee according to an embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of the cavity state of a right-angle converging tee according to an embodiment of the present invention;

[0042] Figure 3 This is a schematic diagram of dividing the right-angle converging tee cavity into two cavities in an embodiment of the present invention.

[0043] Reference numerals:

[0044] 1. First port; 2. Second port; 3. Third port; 4. First sub-cavity; 5. Second sub-cavity; 6. Pipeline. DETAILED DESCRIPTION

[0045] The technical solution of the invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all of the embodiments.

[0046] Example 1

[0047] like Figure 1 and Figure 2 As shown in the figure, a method for calculating the pressure loss of the inlet and outlet of the converging tee cavity is provided. The calculation steps are as follows:

[0048] Step 1, assuming that the confluence tee cavity is a cubic structure or is adjusted on the basis of a cubic structure to form a structure that is approximately cubic, any three sides of the confluence tee cavity are respectively provided with a first port, a second port and a third port, the angle between the first port and the second port is a right angle, and the angles between the third port and the first port and the second port are all right angles, and the fluid flowing out of the confluence tee cavity from different pipes is divided into a right-angle confluence tee cavity state or a right-angle confluence tee cavity state, wherein the fluid confluence from the first port or the third port belongs to the right-angle confluence tee cavity state, and the fluid confluence from the second port or the third port belongs to the right-angle confluence tee cavity state;

[0049] Step 2, calculating the pressure loss of the converging tee cavity, firstly divide the tee cavity into two imaginary first sub-cavities and second sub-cavities with the second port as the midpoint;

[0050] Step 3, using standard fluid mechanics formulas to calculate the pressure losses of the two imaginary cavities at the sudden expansion points;

[0051] Step 4, using the difference principle, respectively calculate the pressure loss of the two imaginary cavities caused by the fluid turning;

[0052] Step 5, obtaining the uncorrected total pressure loss of the first sub-cavity and the uncorrected total pressure loss of the second sub-cavity;

[0053] Step 6, substituting the pressure loss correction coefficient of the converging tee into the corrected total pressure loss of the first sub-cavity and the corrected total pressure loss of the second sub-cavity, that is, the corrected total pressure loss of the first sub-cavity and the corrected total pressure loss of the second sub-cavity in the right-angle converging tee cavity state;

[0054] Step 7, substitute the total pressure loss obtained in step 6 into the conversion correction coefficient of the straight angle and right angle converging tee cavity to obtain the corrected total pressure loss of the first sub-cavity and the corrected total pressure loss of the second sub-cavity in the right angle converging tee cavity state.

[0055] The first port, the second port and the third port all represent a collection of multiple pipes, and the cross-sectional shape of the pipes can be circular, square or triangular.

[0056] In step 3, the expression for the pressure loss at the sudden expansion of the first imaginary cavity is:

[0057]

[0058] The expression for the pressure loss at the sudden expansion of the second imaginary cavity is:

[0059]

[0060] in, ΔP'tp(ex)1 Define the pressure loss at the first imaginary cavity expansion, ΔP' tp(ex)2 Define the pressure loss at the sudden expansion of the second imaginary cavity; α ex is the local resistance coefficient at the sudden expansion; n ex is the number of pipes installed at the fluid inlet port, is the correction coefficient, ρ is the fluid density, g is the gravitational acceleration, u tp1 is the average flow velocity of the fluid in a single pipe at the first port, u tp2 is the average flow velocity of the fluid in a single pipe of the second port, A1 is the isovelocity equivalent circular area of ​​the first imaginary sub-cavity end face connected to the first port or the isovelocity equivalent circular area of ​​the second imaginary sub-cavity end face connected to the second port, A2 is the isovelocity equivalent circular area of ​​a single pipe in the first port or the second port, and tp is an identifier.

[0061] In step 4, the expression for the pressure loss of the first hypothetical cavity caused by the fluid turning is:

[0062]

[0063]

[0064]

[0065]

[0066]

[0067] The expression of the pressure loss caused by the fluid turning in the second imaginary cavity is:

[0068]

[0069]

[0070]

[0071]

[0072]

[0073] Where ΔP' tp(bd)1 is the pressure loss at the corner of unequal cross-section of the first port, ΔP' tp(bd)2 is the pressure loss at the unequal cross-section corner of the second port, ΔP' tp(bd)11 The pressure loss of the equal cross-section bend calculated from the equal flow velocity equivalent area of ​​the total cross-sectional area of ​​the first port, ΔP' tp(bd)12When the pressure loss of the first port is calculated as the pressure loss of the equal cross-section bend by using the equal flow velocity equivalent area of ​​half the total area of ​​the outflow end, ΔP' tp(bd)21 The pressure loss of the equal cross-section bend calculated from the equal flow velocity equivalent area of ​​the total cross-sectional area of ​​the second port, ΔP' tp(bd)22 When the pressure loss of the second port is the pressure loss of the equal cross-section bend, the pressure loss is calculated by the equal flow rate equivalent area of ​​half the total area of ​​the outflow end. bd is the identifier, α tp(bd)11 , α tp(bd)12 When the pressure loss is the pressure loss, the pressure loss coefficient of the equal cross-section bend is calculated by using the equal flow velocity equivalent area of ​​the total cross-sectional area of ​​the first port and the outflow end pipe, and the pressure loss coefficient of the equal cross-section bend is calculated. tp(bd)12 When the outlet port (i.e., the third port) in the first imaginary sub-cavity is 1 / 2 of the area of ​​the original outlet port, and the area and the diameter have a square relationship, the outlet port diameter of the first imaginary sub-cavity is 1 / 2 of the original total outlet port diameter. Right now d tp is the equivalent diameter of the first port or the second port with equal flow rate, a, b, c, d are all constants and can be obtained through experimental measurement; R tp(bd)11 When calculating the pressure loss at the first port, the turning radius when making a turn with equal cross-section at the first port cross-section, R tp(bd)12 When calculating the pressure loss at the first port, the turning radius is the turning radius when half of the total area of ​​the third port is used for equal cross-section turning; α tp(bd)21 When calculating the pressure loss of the second port, the pressure loss coefficient of the equal cross-section bend is calculated by the equal flow rate equivalent area of ​​the total cross-sectional area of ​​the second port, α tp(bd)22 To calculate the pressure loss of the second port, the pressure loss coefficient of the equal cross-section bend is calculated by using the equal flow velocity equivalent area of ​​the total cross-sectional area of ​​the third port. tp(bd)22 When the outlet port (i.e., the third port) in the second imaginary sub-cavity is 1 / 2 of the area of ​​the original outlet port, and the area and diameter have a square relationship, the diameter of the outlet port of the second imaginary sub-cavity is 1 / 2 of the original total outlet port diameter. Right now R tp(bd)21 To calculate the pressure loss at the second port, the turning radius when making a turn with equal cross-section at the second port cross-section, R tp(bd)22 To calculate the pressure loss at the second port, the turning radius is the same as that of the third port when making a turn with a cross section that is half the total area of ​​the third port.

[0074] In step 5, the expression of the uncorrected total pressure loss of the first hypothetical sub-cavity is:

[0075] ΔP' tp1 =ΔP' tp(ex)1 +ΔP' tp(bd)1 ;

[0076] The expression for the uncorrected total pressure loss of the second hypothetical sub-cavity is:

[0077] ΔP' tp2 =ΔP' tp(ex)2 +ΔP' tp(bd)2 ;

[0078] Where ΔP' tp1 is the uncorrected total pressure loss at the second port, ΔP' tp2 is the uncorrected total pressure loss at the second port.

[0079] In step 6, the corrected total pressure loss expression of the first cavity is:

[0080]

[0081] The corrected total pressure loss expression of the second cavity is:

[0082]

[0083] Among them, ΔP tp1 is the corrected total pressure loss at the first port, ΔP tp2 is the total pressure loss after correction at the second port, α tp1 is the first port pressure loss correction coefficient, α tp2 is the pressure loss correction factor of the second port.

[0084] In step 7, the corrected total pressure loss expression of the first sub-cavity in the converging three-way cavity state is:

[0085] ΔP tpa直 =ΔP tp1 α tpa1 ;

[0086] The corrected total pressure loss expression of the second cavity in the converging three-way cavity state is:

[0087] ΔP tpa角 =ΔP tp2 α tpa2 ;

[0088] Among them, α tpa1 is the pressure loss correction factor of the first port, α tpa2 is the pressure loss correction factor of the second port.

[0089] Example 2

[0090] For Figure 1 For the single straight-angle confluence tee cavity shown, when the fluid velocity at inlet 1 reaches 10m / s and the velocity at inlet 2 is also 10m / s, calculate the pressure loss ΔP between the outlet and 1 and 2 respectively. tp1and ΔP tp2 The cavity size is 300mm×1000mm×1000mm, with 3 pipes at each end, a total of 9 pipes, and the pipe size is d tp0 =150mm, length is 20mm, average height of wall particles is 0.7mm, fluid density is 1.3kg / m 3 .

[0091] In this example, the parameters assumed by existing experiments are as follows:

[0092] when Take α tp1 =α tp2 =1

[0093]

[0094]

[0095] Solution: First, divide the cavity in the example into two independent cavities at the midline of the outlet section, namely, the first imaginary sub-cavity and the second imaginary sub-cavity. Calculate the pressure loss from the first port to half of the third port in the first imaginary sub-cavity and the pressure loss from the second port to half of the third port in the second imaginary sub-cavity according to the contents of the present invention.

[0096] (1) Calculation 1. Second hypothetical cavity sudden expansion energy loss

[0097] In this example, 1. The velocity equivalent area A2 of a single pipe of the second imaginary cavity before the sudden expansion and the velocity equivalent area A1 after the sudden expansion are respectively:

[0098]

[0099]

[0100] The resistance coefficient of sudden expansion is α ex for:

[0101]

[0102] From the formula of pressure loss and energy loss, we can know that the pressure loss caused by sudden expansion is:

[0103]

[0104] (2) Calculation of turning energy loss

[0105] For the first hypothetical cavity, the flow velocity before the bend is 10m / s, and the flow velocity of the outflow pipe is 20m / s. The resistance coefficient at the bend is calculated as follows:

[0106]

[0107]

[0108] Thus, the pressure loss caused by the turning of the fluid in the first hypothetical cavity is:

[0109]

[0110]

[0111]

[0112] So the uncorrected total pressure loss of the first imaginary cavity is:

[0113] ΔP' tp1 =ΔP' tp(ex)1 +ΔP' tp(bd)1 =155.6+21.7=177.3(Pa)

[0114] It can be seen that since the fluid flow rate in the first imaginary sub-cavity is too small, the pressure loss is also small and the turning loss does not play a major role.

[0115] Since the conditions in the calculation example are symmetrical, the pressure loss of the second imaginary sub-cavity is the same as that of the first imaginary sub-cavity.

[0116] Then 1. The total pressure loss caused by the turning of the fluid in the second hypothetical cavity is:

[0117]

[0118]

[0119] (3) Losses along the pipeline

[0120] From the conclusion of energy loss calculation in the pipeline of a single cavity energy loss, it can be known that the pressure loss in the first port channel of the first hypothetical sub-cavity is:

[0121]

[0122] The pressure loss of the outlet pipeline is:

[0123]

[0124] Similarly, the pressure loss in the second port channel of the second imaginary cavity is:

[0125]

[0126] The pressure loss of the outlet pipeline is:

[0127]

[0128] (4) Total pressure loss in the cavity of the right-angle confluence tee

[0129] The total energy loss from the first port and the second port to the outlet of the right-angle converging tee in the calculation example can be obtained by cumulative addition:

[0130] ΔP1=177.3+1.1+4.4=182.8(Pa)

[0131] ΔP2=177.3+1.1+4.4=182.8(Pa)

[0132] The calculated result is not much different from the pressure loss of a single straight-angle confluence cavity obtained in the experiment under the same conditions. The calculation of the confluence tee cavity using the content of the present invention has a certain accuracy.

[0133] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for calculating the pressure loss at the inlet and outlet of a converging tee cavity, characterized in that: The calculation steps are as follows: Step 1, assuming that the converging tee cavity is a cubic structure, any three sides of the converging tee cavity are respectively provided with a first port, a second port and a third port, the angle between the first port and the second port is a right angle, and the angles between the third port and the first port and the second port are all right angles, and the fluid flowing out of different pipes of the converging tee cavity is divided into a right-angle converging tee cavity state or a right-angle converging tee cavity state, wherein the fluid converging out from the first port or the third port belongs to the right-angle converging tee cavity state, and the fluid converging out from the second port or the third port belongs to the right-angle converging tee cavity state, and the first port, the second port and the third port all represent a collection of multiple pipes; Step 2, calculating the pressure loss of the converging tee cavity, firstly divide the tee cavity into two imaginary first sub-cavities and second sub-cavities with the second port as the midpoint; Step 3, using the standard formula of fluid mechanics to calculate the pressure loss of the two imaginary sub-cavities at the sudden expansion point, the expression of the pressure loss at the sudden expansion point of the first imaginary sub-cavity is: The expression of pressure loss at the sudden expansion of the second imaginary cavity is: in, ΔP' tp(ex)1 Define the pressure loss at the sudden expansion of the first imaginary cavity, ΔP' tp(ex)2 Define the pressure loss at the sudden expansion of the second imaginary cavity; α ex is the local resistance coefficient at the sudden expansion; n ex is the number of pipes installed at the fluid inlet port, is the correction coefficient, ρ is the fluid density, g is the gravitational acceleration, u tp1 is the average flow velocity of the fluid in a single pipe at the first port, u tp2 is the average flow rate of the fluid in a single pipe of the second port, A1 is the isovelocity equivalent circular area of ​​the first imaginary sub-cavity end face connected to the first port or the isovelocity equivalent circular area of ​​the second imaginary sub-cavity end face connected to the second port, A2 is the isovelocity equivalent circular area of ​​a single pipe in the first port or the second port, and tp is an identifier; Step 4, using the difference principle, respectively calculate the pressure loss of the two imaginary cavities caused by the fluid turning; Step 5, obtaining the uncorrected total pressure loss of the first sub-cavity and the uncorrected total pressure loss of the second sub-cavity; Step 6, substituting the pressure loss correction coefficient of the converging tee into the corrected total pressure loss of the first sub-cavity and the corrected total pressure loss of the second sub-cavity, that is, the corrected total pressure loss of the first sub-cavity and the corrected total pressure loss of the second sub-cavity in the right-angle converging tee cavity state; Step 7, substitute the total pressure loss obtained in step 6 into the conversion correction coefficient of the straight angle and right angle converging tee cavity to obtain the corrected total pressure loss of the first sub-cavity and the corrected total pressure loss of the second sub-cavity in the right angle converging tee cavity state.

2. The method for calculating the pressure loss at the inlet and outlet of the converging tee cavity according to claim 1 is characterized in that: In step 4, the expression for the pressure loss of the first hypothetical cavity caused by the fluid turning is: The expression of the pressure loss caused by the fluid turning in the second imaginary cavity is: Where ΔP' tp(bd)1 is the pressure loss at the corner of unequal cross section of the first port, ΔP' tp(bd)2 is the pressure loss at the unequal cross-section corner of the second port, ΔP' tp(bd)11 The pressure loss of the equal cross-section bend calculated from the equal flow velocity equivalent area of ​​the total cross-sectional area of ​​the first port, ΔP' tp(bd)12 When the pressure loss of the first port is the pressure loss of the equal cross-section bend, the pressure loss is calculated by using the equal flow velocity equivalent area of ​​half the total area of ​​the outflow end. ΔP' tp(bd)21 The pressure loss of the equal cross-section bend calculated from the equal flow velocity equivalent area of ​​the total cross-sectional area of ​​the second port, ΔP' tp(bd)22 When it is the pressure loss of the second port, the pressure loss of the equal-section bend is calculated by using the equal-flow velocity equivalent area of ​​half the total area of ​​the outflow end, and bd is the identifier.

3. The method for calculating the pressure loss at the inlet and outlet of the converging tee cavity according to claim 1 is characterized in that: In step 5, the expression of the uncorrected total pressure loss of the first hypothetical sub-cavity is: ΔP' tp1 =ΔP' tp(ex)1 +ΔP' tp(bd)1 ; The expression for the uncorrected total pressure loss of the second hypothetical sub-cavity is: ΔP' tp2 =ΔP' tp(ex)2 +ΔP' tp(bd)2 ; Where ΔP' tp1 is the uncorrected total pressure loss at the second port, ΔP' tp2 is the uncorrected total pressure loss at the second port.

4. The method for calculating the pressure loss at the inlet and outlet of the converging tee cavity according to claim 1 is characterized in that: In step 6, the corrected total pressure loss expression of the first cavity is: The corrected total pressure loss expression of the second cavity is: Where ΔP tp1 is the corrected total pressure loss at the first port, ΔP tp2 is the total pressure loss after correction at the second port, α tp1 is the first port pressure loss correction coefficient, α tp2 is the pressure loss correction factor of the second port.

5. The method for calculating the pressure loss at the inlet and outlet of the converging tee cavity according to claim 1 is characterized in that: In step 7, the corrected total pressure loss expression of the first sub-cavity in the converging three-way cavity state is: ΔP tpa直 =ΔP tp1 ·a tpa1 ; The corrected total pressure loss expression of the second cavity in the converging three-way cavity state is: ΔP tpa角 =ΔP tp2 ·a tpa2 ; Among them, α tpa1 is the pressure loss correction coefficient of the first port, α tpa2 is the pressure loss correction factor of the second port.

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