Device and method for testing heat exchange and flow resistance coefficients of cooling medium

Abstract

The invention relates to a cooling medium heat exchange and flow resistance coefficient testing device and method, and the method comprises the steps: constructing a cooling medium testing device, and determining a to-be-tested cooling medium which is used for inputting the cooling medium testing device; the cooling medium testing device comprises a connecting flange, a single-path cooling flow channel, a temperature sensor and a pressure sensor, the temperature sensors are arranged on the single-path cooling flow channel at equal intervals in the circumferential direction of the connecting flange; the pressure sensors are arranged on the single-path cooling flow channel at equal intervals in the circumferential direction of the connecting flange; connecting the connecting flange to an outlet of an engine combustion chamber and inputting a to-be-tested cooling medium to the one-way cooling flow channel so as to heat the connecting flange based on high-temperature fuel gas output by the engine combustion chamber; the temperatures and the pressures of adjacent positions of the interval sections on the single-path cooling flow channel are collected based on the temperature sensor and the pressure sensor respectively, and the heat exchange coefficient and the flow resistance coefficient of the cooling medium to be measured are obtained through calculation based on the temperatures and the pressures.

Description

Technical Field

[0001] The invention relates to the field of aerospace, and in particular to a device and method for testing heat exchange and flow resistance coefficient of a cooling medium. Background Art

[0002] Due to its high temperature working environment, the engine often adopts active cooling structure as a thermal protection design solution. Common cooling media for engines are mainly hydrocarbon fuels such as kerosene and methane. Their heat exchange and flow resistance characteristics are the key to the design of active cooling channels. When the heat exchange between the cooling medium and the cooling channel is insufficient, it will cause problems such as overheating and overtemperature of the cooling channel, thereby affecting the service life and working reliability of the engine. When the resistance of the cooling medium flowing in the cooling channel is too large, it will cause pressure drop loss in the channel and excessive working pressure of the cooling medium supply pump, which will cause problems such as excessive pump energy consumption. The heat transfer and flow resistance characteristics of the cooling medium in the cooling channel are related to the shape, physical properties, flow state of the cooling medium, and the size and surface roughness of the cooling channel. During the temperature rise process, the cooling medium presents liquid, gas, and gas-liquid mixed states. The rapid changes in the physical properties of the cooling medium, such as specific heat, density, and viscosity, at different temperatures and working pressures will cause changes in the heat transfer and flow resistance characteristics of the cooling medium. In addition, due to changes in the cooling medium flow rate, flow velocity, and cooling channel size, the cooling medium will experience laminar flow, turbulent flow, or a combination of the two in the cooling channel. Taking all the above factors into consideration, the heat transfer and flow resistance characteristics of the cooling medium in the active cooling channel of the engine are complex and changeable.

[0003] For the test of heat transfer and flow resistance coefficient of cooling medium, the conventional test method mainly adopts single-tube heating method. Due to the slow heating rate, the heating of cooling medium is relatively uniform. This heating method cannot simulate the thermal environment in the engine cooling channel, and thus cannot accurately obtain the flow law of cooling medium in the engine cooling channel. In addition, the single-tube heating test requires a long time to heat the cooling medium to reach steady-state thermal equilibrium, and the test cycle is long, which requires a lot of manpower and material resources. Summary of the invention

[0004] The object of the present invention is to provide a device and method for testing the heat exchange and flow resistance coefficient of a cooling medium.

[0005] To achieve the above-mentioned object of the invention, the present invention provides a method for testing the heat transfer and flow resistance coefficient of a cooling medium, comprising the following steps: S1. Construct a cooling medium test device and determine a cooling medium to be tested for input into the cooling medium test device; wherein the cooling medium test device comprises: a connecting flange, a single cooling channel arranged on the outer side of the connecting flange, and a temperature sensor and a pressure sensor arranged on the single cooling channel; Along the circumference of the connecting flange, the single cooling channel is regularly arranged on the outer side of the connecting flange in a circuitous manner; The temperature sensors are arranged at equal intervals on the single cooling channel along the circumference of the connecting flange; The pressure sensors are arranged at equal intervals on the single cooling channel along the circumference of the connecting flange; S2. Connecting the connecting flange to the outlet of the engine combustion chamber and inputting the cooling medium to be tested into the single cooling channel to heat the connecting flange based on the high-temperature gas output from the engine combustion chamber; S3. Based on the temperature sensor and the pressure sensor, the temperature and pressure of adjacent positions of equally spaced segments on the single cooling channel are respectively collected, and the heat transfer coefficient and flow resistance coefficient of the cooling medium to be measured are obtained after calculation based on the temperature and the pressure.

[0006] According to one aspect of the present invention, the input port and the output port of the single-channel cooling channel are arranged adjacent to each other; The rib width of the single-channel cooling channel is consistent along the entirety, the channel width is consistent along the entirety, and the channel height is consistent along the entirety.

[0007] According to one aspect of the present invention, the temperature sensors and the pressure sensors adjacent to each other at equal intervals on the single cooling channel are installed in a staggered arrangement.

[0008] According to one aspect of the present invention, the input port of the single-channel cooling channel is provided with a flow control device; The flow control device is a flow pump, or the flow control device is connected to a venturi of a boosting pipe, so as to control the cavitation flow at a preset pressure.

[0009] According to one aspect of the present invention, the output port of the single-channel cooling channel is provided with an orifice throttling member for controlling the outlet pressure of the output port.

[0010] According to one aspect of the present invention, in step S3, based on the temperature sensor and the pressure sensor, the temperature and pressure of adjacent positions of equally spaced segments on the single-channel cooling channel are respectively collected, and based on the temperature and the pressure, the heat transfer coefficient and the flow resistance coefficient of the cooling medium to be measured are obtained, wherein the heat transfer coefficient is the heat transfer coefficient at the average temperature and average pressure of the adjacent interval segments, and the flow resistance coefficient is the flow resistance coefficient at the average temperature of the adjacent interval segments.

[0011] According to one aspect of the present invention, the heat transfer coefficient is obtained based on the following steps, which include: S3a1. Obtain the inlet mass flow rate of the cooling medium to be measured at the input port , and obtain the inlet temperature of the cooling medium to be measured at adjacent positions of the equally spaced segments and outlet temperature , to obtain the heat absorption power of the high temperature gas on the cooling medium to be tested when the cooling medium to be tested is in this equal interval section , and is expressed as:

[0012] in, H i , H i+1 The cooling medium to be tested is at the temperature and temperature Enthalpy value at ; S3a2. Obtain the average heat flux density of the high-temperature gas heating the connecting flange when the cooling medium to be tested flows through the equally spaced sections. q i , and is expressed as:

[0013] in, T r It is the recovery temperature of the high-temperature fuel gas output from the engine combustion chamber. h 0 is the heat transfer coefficient between high temperature gas and the connecting flange wall, is the heat transfer coefficient between the cooling medium to be tested and the wall of the connecting flange, η p is the rib effect coefficient, t is the side wall thickness of the connecting flange, λ is the thermal conductivity of the connecting flange; S3a3. Obtaining the heating power when the cooling medium to be tested flows through the equally spaced segments , and is expressed as:

[0014] in, A i is the contact area between the high-temperature gas and the wall surface of the connecting flange when the cooling medium to be tested flows through the equally spaced sections; S3a4. Based on the law of conservation of energy, establish the heat absorption power of the high-temperature gas in the same equal interval section to the cooling medium to be tested The heating power when the cooling medium to be tested flows through the equally spaced segments Equal relationship to obtain the heat transfer coefficient, which can be expressed as:

[0015] in, Represents the heat transfer coefficient.

[0016] According to one aspect of the present invention, the flow resistance coefficient is obtained based on the following steps, which include: S3b1. Obtain the pressure loss of the cooling medium to be tested in the single cooling channel, and express it as:

[0017] in, λ is the flow resistance coefficient, l is the flow channel length, d is the hydraulic diameter of the cooling channel, ρ is the cooling medium density, , b It is the height and width of a single cooling channel; S3b2. Obtain the inlet temperature of the cooling medium to be measured flowing through adjacent positions of the equally spaced segments T i , outlet temperature T i+1 and inlet pressure P i , outlet pressure P i+1 , and obtain the flow resistance at the average temperature of the equally spaced segments, which is expressed as:

[0018] in, ρ i Indicates the average temperature of the cooling medium to be tested ( T i + T i+1 ) / 2; S3b3. Based on the average temperature of the cooling medium to be measured flowing through the equally spaced segments ( T i + T i+1 ) / 2 to obtain its flow resistance coefficient, which can be expressed as:

[0019]

[0020] in, λ i represents the flow resistance coefficient, λ oi It represents the flow resistance coefficient of the cooling medium to be tested flowing through the equally spaced sections at room temperature. ρ 0 is the density of the cooling medium to be tested at room temperature, P 0i , P 0i+1 Indicates the mass flow rate at room temperature The inlet pressure and outlet pressure of the cooling medium to be measured at adjacent positions of the equally spaced segments, Δ p 0i It indicates the flow resistance of the cooling medium to be tested flowing through equally spaced segments at room temperature.

[0021] To achieve the above-mentioned purpose, the present invention provides a testing device for the above-mentioned heat exchange and flow resistance coefficient testing method, comprising: a connecting flange, a single-channel cooling channel arranged on the outer side of the connecting flange, and a temperature sensor and a pressure sensor arranged on the single-channel cooling channel; Along the circumference of the connecting flange, the single cooling channel is regularly arranged on the outer side of the connecting flange in a circuitous manner; The temperature sensors are arranged at equal intervals on the single cooling channel along the circumference of the connecting flange; The pressure sensors are arranged at equal intervals on the single-channel cooling channel along the circumference of the connecting flange.

[0022] According to one aspect of the present invention, the input port and the output port of the single-channel cooling channel are arranged adjacent to each other; The rib width of the single-channel cooling channel is consistent along the entirety, the channel width is consistent along the entirety, and the channel height is consistent along the entirety; The temperature sensors and the pressure sensors adjacent to each other at equal intervals on the single cooling channel are installed in a staggered arrangement; The input port of the single-channel cooling channel is provided with a flow control device; The output port of the single-channel cooling channel is provided with an orifice throttling element for controlling the outlet pressure of the output port; The flow control device is a flow pump, or the flow control device is connected to a venturi of a boosting pipe, so as to control the cavitation flow at a preset pressure.

[0023] According to one solution of the present invention, the present invention can quickly test the temperature and pressure parameter changes of the cooling medium to be tested in the cooling channel under different mass flow rates. Compared with the traditional single-tube heating test method, the present invention has the characteristics of low test cost and short cycle.

[0024] According to one solution of the present invention, the present invention uses the high temperature gas at the outlet of the engine combustion chamber to heat the cooling medium of the test device with good circumferential uniformity and high heater efficiency. At the same time, the working conditions of the engine combustion chamber are ensured to be consistent, which can ensure that the thermal environment for heating the cooling medium is consistent under each test condition.

[0025] According to one solution of the present invention, the present invention can test the temperature and pressure parameter changes of the cooling medium in the cooling channel along the cooling channel under the rated flow and back pressure of the cooling medium through a single test, and the validity and consistency of the test data are good.

[0026] According to one solution of the present invention, the present invention can fully obtain the heat transfer and flow resistance coefficients of the cooling medium to be tested at different operating temperatures and pressures, thereby improving the accuracy of the heat transfer and pressure drop engineering design of the engine active cooling channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a flowchart schematically showing a method for testing heat transfer and flow resistance coefficient according to an embodiment of the present invention; Figure 2 is a structural diagram schematically showing a testing device according to an embodiment of the present invention; Figure 3 It is a schematic representation Figure 2 A magnified view of a local location in the Figure 4 FIG. 1 is a diagram schematically showing the distribution of temperature sensors and pressure sensors in a testing device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] When describing the embodiments of the present invention, the orientation or positional relationship expressed by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the relevant drawings and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0030] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not therefore limited to the following embodiments.

[0031] Combination Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, according to one embodiment of the present invention, a method for testing heat transfer and flow resistance coefficient of a cooling medium of the present invention comprises the following steps: S1. Construct a cooling medium test device, and determine the cooling medium to be tested for input into the cooling medium test device; wherein the cooling medium test device comprises: a connecting flange 11, a single cooling channel 12 arranged on the outer side of the connecting flange 1, and a temperature sensor 13 and a pressure sensor 14 arranged on the single cooling channel 12; wherein, along the circumference of the connecting flange 11, the single cooling channel 12 is regularly arranged on the outer side of the connecting flange 11 in a circuitous manner; along the circumference of the connecting flange 11, the temperature sensors 13 are arranged at equal intervals on the single cooling channel 12; along the circumference of the connecting flange 11, the pressure sensors 14 are arranged at equal intervals on the single cooling channel 12; S2. The connecting flange 11 is connected to the outlet of the engine combustion chamber and the cooling medium to be tested is input into the single cooling channel 12 to heat the connecting flange 11 based on the high-temperature gas output from the engine combustion chamber; S3. Based on the temperature sensor 13 and the pressure sensor 14, the temperature and pressure of the adjacent positions of the interval section on the single-channel cooling channel 12 are respectively collected, and the heat transfer coefficient and flow resistance coefficient of the cooling medium to be measured are obtained after calculation based on the temperature and pressure.

[0032] Combination Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, according to an embodiment of the present invention, the connection flange 11 includes: a mounting cylinder and a connection ring arranged at one end of the mounting cylinder, wherein a plurality of through holes are arranged at equal intervals on the connection ring to facilitate the use of a connector to install and fix the connection flange 11. In this embodiment, the mounting cylinder is a cylinder as a whole, and a single-channel cooling channel 12 can be arranged on its outer surface; wherein the single-channel cooling channel 12 is fixedly connected to the mounting cylinder in contact with each other to achieve heat exchange with the mounting cylinder.

[0033] In this embodiment, the single-channel cooling channel 12 includes: an axial channel portion and a radial connection portion, wherein the axial connection portion is a straight pipe, and a plurality of axial connection portions are arranged in parallel at equal intervals on the connection flange 11, and the radial connection portions are respectively connected to adjacent axial channel portions, so as to realize that a plurality of axial channel portions are sequentially connected end to end to achieve a tortuous structure. Of course, in this embodiment, in order to ensure the unidirectional flow of the cooling medium to be tested, two of the axial channel portions are selected as the head and tail portions of the entire single-channel cooling channel 12, and the input port 121 and the output port 122 are respectively set at the ends to achieve the unidirectional flow of the cooling medium to be tested from input to output.

[0034] In this embodiment, the input port 121 and the output port 122 of the single-channel cooling channel 12 are arranged adjacent to each other, that is, in the axial direction of the connecting flange 11, the input port 121 and the output port 122 are respectively arranged at the same side ends of two adjacent axial channel parts, so as to achieve the unification of the input and output positions of the cooling medium to be tested, and facilitate the installation of the corresponding structure to simplify the overall structure.

[0035] In this embodiment, the rib width, channel width, and channel height of the single cooling channel 12 are consistent along the entirety of the channel; wherein the single cooling channel 12 is a rectangular channel having a rectangular cross-section.

[0036] In this embodiment, the connecting flange 11 can be divided into a plurality of equally spaced segments along the circumference of the connecting flange 11, and the temperature sensor 13 and the pressure sensor 14 can be arranged at equal intervals based on the positions of the equally spaced segments, wherein the positions of the temperature sensor 13 and the pressure sensor 14 are spaced along the axial direction of the connecting flange 11.

[0037] Combination Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, according to an embodiment of the present invention, the temperature sensors 13 and pressure sensors 14 adjacent to each other at equal intervals on the single cooling channel 12 are installed in a staggered arrangement. Specifically, in the axial direction of the connecting flange 11, the arrangement of the temperature sensors 13 and the pressure sensors 14 forms two circles of measuring positions, and in each circle of measuring positions, the temperature sensors 13 and the pressure sensors 14 are arranged in an alternating manner, and in the axial direction of the connecting flange 11, the temperature sensors 13 and the pressure sensors 14 are spaced apart on the same axial flow channel portion, thereby achieving a staggered arrangement.

[0038] Combination Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, according to an embodiment of the present invention, the input port 121 of the single-channel cooling channel 12 is provided with a flow control device; wherein the flow control device is a flow pump, and the flow pump is used to achieve real-time control of the flow. Alternatively, the flow control device is connected to a venturi tube of a boosting pipe to control the cavitation flow at a preset pressure, wherein the flow control is achieved by the cavitation flow of the venturi tube at a certain rated pressure based on the boosting of the boosting tank.

[0039] Combination Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, according to one embodiment of the present invention, the output port 122 of the single-channel cooling channel 12 is provided with an orifice throttling member for controlling the outlet pressure of the output port 122. In this embodiment, the orifice throttling member has a variety of specifications, and thus, the outlet pressure can be adjusted by orifice throttling members of different specifications to meet the measurement requirements under different pressure parameters and temperatures of the cooling medium to be measured.

[0040] Combination Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, according to one embodiment of the present invention, in step S3, the temperature and pressure of adjacent positions of the interval segments on the single-channel cooling channel 12 are respectively collected based on the temperature sensor 13 and the pressure sensor 14, and the heat transfer coefficient and flow resistance coefficient of the cooling medium to be measured are obtained based on the temperature and pressure. The heat transfer coefficient is the heat transfer coefficient at the average temperature and average pressure of the adjacent interval segments, and the flow resistance coefficient is the flow resistance coefficient at the average temperature of the adjacent interval segments.

[0041] Combination Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, according to one embodiment of the present invention, the convective heat transfer coefficient between the cooling medium and the solid wall surface represents the heat transfer capacity between the cooling medium and the solid surface, that is, the temperature difference between the cooling medium and the solid wall surface is 1K, and the heat exchange amount between the cooling medium and the solid wall surface by convection per unit time and per unit area, and the unit is W / (m 2 ·K), thus, the size of the heat transfer coefficient reflects the strength of convective heat transfer. In this embodiment, the heat transfer coefficient is obtained based on the following steps, which include: S3a1. Obtain the inlet mass flow rate of the cooling medium to be measured at the input port 121 , and obtain the temperature of adjacent positions of the cooling medium flowing through the equally spaced segments T i and temperature T i+1 , and then the heat absorption power of the high-temperature gas on the cooling medium to be tested in the equal interval section can be calculated under steady state , and is expressed as:

[0042] in, H i , H i+1 The cooling medium to be tested is at the temperature and temperature Enthalpy value at ; S3a2. Obtain the average heat flux density of the high-temperature gas heating the connecting flange 11 when the cooling medium to be tested flows through the equally spaced sections.q i , and is expressed as:

[0043] in, T r It is the recovery temperature of the high-temperature fuel gas output from the engine combustion chamber. h 0 is the heat transfer coefficient between the high temperature gas and the wall of the connecting flange 11, is the heat transfer coefficient between the cooling medium to be tested and the wall of the connecting flange 11, η p is the rib effect coefficient, t is the side wall thickness of the connecting flange 11, λ is the thermal conductivity of the connecting flange 11; S3a3. Obtain the heating power when the cooling medium to be tested flows through the equally spaced segments , and is expressed as:

[0044] in, A i is the contact area between the high temperature gas and the wall surface of the connecting flange 11 when the cooling medium to be measured flows through the equally spaced sections; S3a4. Based on the law of conservation of energy, establish the heat absorption power of the high-temperature gas in the same equal interval section to the cooling medium to be tested The heating power when the cooling medium to be tested flows through the equal interval section Equal relationship, in order to obtain the average temperature ( T i + T i+1 ) / 2 and the average pressure ( P i + P i+1 ) / 2, and is expressed as:

[0045] in, Represents the heat transfer coefficient.

[0046] In this embodiment, the heat exchange coefficient between the cooling medium to be tested and the wall surface of the connecting flange 11 at a certain rated flow rate, working back pressure and corresponding working temperature can be obtained by repeating the test for many times.

[0047] Combination Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, according to one embodiment of the present invention, the flow resistance coefficient is obtained based on the following steps, which include: S3b1. Obtain the pressure loss of the cooling medium to be tested in the single cooling channel 12, wherein the pressure loss in the single cooling channel 12 includes two types of along-the-way pressure loss and local pressure loss, which are expressed as:

[0048] in, λ is the flow resistance coefficient, l is the flow channel length, d is the hydraulic diameter of the cooling channel, ρ is the density of the cooling medium, u is the flow rate.

[0049] The flow resistance coefficient is mainly related to the flow state of the cooling medium to be measured, the surface roughness and geometric shape of the channel. In engineering applications, it is often fitted by the Reynolds number Re.

[0050] The flow state of the cooling medium to be tested in the single-channel cooling channel 12 is mainly divided into two types: laminar flow and turbulent flow, which is mainly related to the Reynolds number Re and is expressed as:

[0051] in, v is the kinematic viscosity of the cooling medium to be tested.

[0052] For a rectangular channel, the hydraulic diameter d It is expressed as:

[0053] in, , b It is the height and width of the single cooling channel 12.

[0054] The cooling medium to be measured is at mass flow rate The flow velocity of a channel section is u It is expressed as:

[0055] in, ρ Indicates the density of the cooling medium.

[0056] Furthermore, due to the density of the cooling medium to be tested ρ , kinematic viscosity v It changes with the change of temperature and pressure, which causes the flow resistance coefficient to change with the change of the temperature and pressure of the cooling medium to be measured; thus, the pressure loss in the single-channel cooling channel 12 can be transformed into: .

[0057] S3b2. Obtain the temperature of adjacent positions of the cooling medium to be tested when it flows through the equally spaced segmentsT i ,temperature T i+1 and pressure P i ,pressure P i+1 , and obtain the flow resistance at the average temperature of the equally spaced segments; in this embodiment, at room temperature, the mass flow rate is used The pressures of the cooling medium to be tested at adjacent positions in a certain equal interval section are P 0i , P 0i +1, then the flow resistance of the cooling medium to be tested in a certain equal interval section at room temperature is Δ p 0i for:

[0058] in, ρ 0 is the density of the cooling medium to be tested at room temperature, λ 0i It is the flow resistance coefficient of the cooling medium to be tested in the equally spaced sections at room temperature.

[0059] Furthermore, according to the flow resistance coefficient of each equally spaced section at room temperature, the average flow resistance coefficient at room temperature is obtained. λ 0, and is represented by:

[0060] in, n Indicates the number of equally spaced segments.

[0061] By heating the test device, the inlet temperature of adjacent positions of the equally spaced segments is measured T i , outlet temperature T i+1 , inlet pressure of cooling medium P i , outlet pressure P i+1 , then a certain equal interval segment has an average temperature ( T i + T i+1 ) / 2 has a flow resistance of

[0062] in, ρ i Indicates the average temperature of the cooling medium to be tested ( T i + T i+1 ) / 2; S3b3. Obtain the flow resistance coefficient based on the flow resistance of the cooling medium to be measured flowing through the equally spaced segments at the average temperature, and express it as:

[0063]

[0064] in, λ i represents the flow resistance coefficient, λ oi It indicates the flow resistance coefficient of the cooling medium to be tested flowing through the equally spaced sections at room temperature. ρ 0 is the density of the cooling medium to be tested at room temperature, P 0i , P 0i+1 Indicates the mass flow rate at room temperature The pressure of the cooling medium to be tested flowing through adjacent positions of equally spaced segments, Δ p 0i It indicates the flow resistance of the cooling medium to be tested flowing through equally spaced sections at room temperature.

[0065] In this embodiment, the flow resistance coefficient of the cooling medium to be tested flowing through the single-channel cooling channel 12 at a certain rated flow rate, working back pressure and corresponding working temperature can be obtained by repeating the test multiple times.

[0066] Combination Figure 2 , Figure 3 and Figure 4 As shown, the present invention provides a test device for the aforementioned heat exchange and flow resistance coefficient test method, comprising: a connecting flange 11, a single cooling channel 12 arranged on the outer side of the connecting flange 11, and a temperature sensor 13 and a pressure sensor 14 arranged on the single cooling channel 12; in this embodiment, along the circumference of the connecting flange 11, the single cooling channel 12 is regularly arranged on the outer side of the connecting flange 11 in a circuitous manner; further, along the circumference of the connecting flange 11, the temperature sensors 13 are arranged at equal intervals on the single cooling channel 12; along the circumference of the connecting flange 11, the pressure sensors 14 are arranged at equal intervals on the single cooling channel 12.

[0067] Combination Figure 2 , Figure 3 and Figure 4As shown, according to one embodiment of the present invention, the input port 121 and the output port 122 of the single-channel cooling channel 12 are arranged adjacent to each other; wherein the rib width along the single-channel cooling channel 12 is consistent, the channel width along the channel is consistent, and the channel height along the channel is consistent. In this embodiment, the temperature sensors 13 and the pressure sensors 14 adjacent to the equally spaced sections on the single-channel cooling channel 12 are installed in a staggered arrangement; further, the input port 121 of the single-channel cooling channel 12 is provided with a flow control device; the output port 122 of the single-channel cooling channel 12 is provided with an orifice throttling device for controlling the outlet pressure of the output port 122. In this embodiment, the flow control device is a flow pump, or the flow control device is connected to a venturi tube of a boost pipe, so as to control the cavitation flow at a preset pressure.

[0068] The above contents are merely examples of specific solutions of the present invention. For devices and structures not described in detail therein, it should be understood that they can be implemented by adopting general devices and general methods available in the art.

[0069] The above is only one solution of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for testing heat transfer and flow resistance coefficient of a cooling medium, characterized in that: The following steps are involved: S1. constructing a cooling medium test device and determining a cooling medium to be tested for input into the cooling medium test device; wherein the cooling medium test device comprises: a connecting flange (11), a single cooling channel (12) arranged on the outer side of the connecting flange (11), and a temperature sensor (13) and a pressure sensor (14) arranged on the single cooling channel (12); Along the circumference of the connecting flange (11), the single-path cooling channel (12) is regularly arranged on the outer side of the connecting flange (11) in a circuitous manner; The temperature sensors (13) are arranged at equal intervals on the single-channel cooling channel (12) along the circumference of the connecting flange (11); The pressure sensors (14) are arranged at equal intervals on the single-channel cooling channel (12) along the circumference of the connecting flange (11); S2. Connecting the connecting flange (11) to the outlet of the engine combustion chamber and inputting the cooling medium to be tested into the single cooling channel (12) to heat the connecting flange (11) based on the high-temperature combustion gas output from the engine combustion chamber; S3. Based on the temperature sensor (13) and the pressure sensor (14), the temperature and pressure of adjacent positions of equally spaced sections on the single cooling channel (12) are respectively collected, and the heat transfer coefficient and flow resistance coefficient of the cooling medium to be measured are obtained after calculation based on the temperature and the pressure.

2. The method for testing heat transfer and flow resistance coefficient according to claim 1, characterized in that: The input port (121) and the output port (122) of the single-channel cooling channel (12) are arranged adjacent to each other; The rib width of the single-channel cooling channel (12) is consistent along the entirety, the channel width is consistent along the entirety, and the channel height is consistent along the entirety.

3. The method for testing heat transfer and flow resistance coefficient according to claim 2, characterized in that: The temperature sensors (13) and the pressure sensors (14) adjacent to each other at equal intervals on the single-channel cooling channel (12) are installed in a staggered arrangement.

4. The method for testing heat transfer and flow resistance coefficient according to claim 2, characterized in that: The input port (121) of the single-channel cooling channel (12) is provided with a flow control device; The flow control device is a flow pump, or the flow control device is connected to a venturi of a boosting pipe, so as to control the cavitation flow at a preset pressure.

5. The method for testing heat transfer and flow resistance coefficient according to claim 4, characterized in that: The output port (122) of the single-channel cooling channel (12) is provided with an orifice throttling element for controlling the outlet pressure of the output port (122).

6. The method for testing heat transfer and flow resistance coefficient according to claim 5, characterized in that: In step S3, the temperature and pressure of adjacent positions of equally spaced segments on the single-channel cooling channel (12) are respectively collected based on the temperature sensor (13) and the pressure sensor (14), and the heat transfer coefficient and flow resistance coefficient of the cooling medium to be measured are obtained based on the temperature and the pressure, wherein the heat transfer coefficient is the heat transfer coefficient at the average temperature and average pressure of the adjacent interval segments, and the flow resistance coefficient is the flow resistance coefficient at the average temperature of the adjacent interval segments.

7. The method for testing heat transfer and flow resistance coefficient according to claim 6, characterized in that: The heat transfer coefficient is obtained based on the following steps, which include: S3a1. Obtaining the inlet mass flow rate of the cooling medium to be measured at the input port (121) , and obtain the inlet temperature of the cooling medium to be measured at adjacent positions of the equally spaced segments and outlet temperature , to obtain the heat absorption power of the high temperature gas on the cooling medium to be tested when the cooling medium to be tested is in this equal interval section , and is expressed as: in, H i , H i+1 The cooling medium to be tested is at the temperature and temperature Enthalpy value at ; S3a2. Obtaining the average heat flux density of the high-temperature gas heating the connecting flange (11) when the cooling medium to be tested flows through the equally spaced sections. q i , and is expressed as: in, T r It is the recovery temperature of the high-temperature fuel gas output from the engine combustion chamber. h 0 is the heat transfer coefficient between the high temperature gas and the wall of the connecting flange (11), is the heat transfer coefficient between the cooling medium to be tested and the wall surface of the connecting flange (11), η p is the rib effect coefficient, t is the side wall thickness of the connecting flange (11), λ is the thermal conductivity of the connecting flange (11); S3a3. Obtaining the heating power when the cooling medium to be tested flows through the equally spaced segments , and is expressed as: in, A i is the contact area between the high-temperature gas and the wall surface of the connecting flange (11) when the cooling medium to be measured flows through the equally spaced sections; S3a4. Based on the law of conservation of energy, establish the heat absorption power of the high-temperature gas in the same equal interval section to the cooling medium to be tested The heating power when the cooling medium to be tested flows through the equally spaced segments Equal relationship to obtain the heat transfer coefficient, which can be expressed as: in, Represents the heat transfer coefficient.

8. The method for testing heat transfer and flow resistance coefficient according to claim 7, characterized in that: The flow resistance coefficient is obtained based on the following steps, which include: S3b1. Obtain the pressure loss of the cooling medium to be tested in the single cooling channel (12), and express it as: in, λ is the flow resistance coefficient, l is the flow channel length, d is the hydraulic diameter of the cooling channel, ρ is the density of the cooling medium, , b are the height and width of the single cooling channel (12); S3b2. Obtain the inlet temperature of the cooling medium to be measured flowing through adjacent positions of the equally spaced segments T i , outlet temperature T i+1 and inlet pressure P i , outlet pressure P i+1 , and obtain the average temperature of the equally spaced segments ( T i + T i+1 ) / 2, which is expressed as: in, ρ i Indicates the average temperature of the cooling medium to be tested ( T i + T i+1 ) / 2; S3b3. Based on the average temperature of the cooling medium to be measured flowing through the equally spaced segments ( T i + T i+1 ) / 2 to obtain its flow resistance coefficient, which can be expressed as: in, λ i represents the flow resistance coefficient, λ oi It represents the flow resistance coefficient of the cooling medium to be tested flowing through the equally spaced sections at room temperature. ρ 0 is the density of the cooling medium to be tested at room temperature, P 0i , P 0i+1 Indicates the mass flow rate at room temperature The inlet pressure and outlet pressure of the cooling medium to be measured at adjacent positions of the equally spaced segments, Δ p 0i It indicates the flow resistance of the cooling medium to be tested flowing through equally spaced segments at room temperature.

9. A testing device for the heat transfer and flow resistance coefficient testing method according to any one of claims 1 to 8, characterized in that: include: A connecting flange (11), a single-channel cooling channel (12) arranged on the outer side of the connecting flange (11), and a temperature sensor (13) and a pressure sensor (14) arranged on the single-channel cooling channel (12); Along the circumference of the connecting flange (11), the single-path cooling channel (12) is regularly arranged on the outer side of the connecting flange (11) in a circuitous manner; The temperature sensors (13) are arranged at equal intervals on the single-channel cooling channel (12) along the circumference of the connecting flange (11); The pressure sensors (14) are arranged at equal intervals on the single-channel cooling channel (12) along the circumference of the connecting flange (11).

10. The testing device according to claim 9, characterized in that: The input port (121) and the output port (122) of the single-channel cooling channel (12) are arranged adjacent to each other; The single-channel cooling channel (12) has a consistent rib width along the entirety of the channel, a consistent channel width along the entirety of the channel, and a consistent channel height along the entirety of the channel; The temperature sensors (13) and the pressure sensors (14) adjacent to each other at equal intervals on the single cooling channel (12) are installed in a staggered arrangement; The input port (121) of the single-channel cooling channel (12) is provided with a flow control device; The output port (122) of the single-channel cooling channel (12) is provided with an orifice throttling element for controlling the outlet pressure of the output port (122); The flow control device is a flow pump, or the flow control device is connected to a venturi of a boosting pipe, so as to control the cavitation flow at a preset pressure.

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