Full-bionic S-shaped turbulent flow structure for motor radiator

Abstract

The invention relates to a full-bionic S-shaped turbulent flow structure for a motor radiator, four wall surfaces of a channel are all formed by bionic S-shaped wall surfaces, two wall surfaces at opposite positions adopt the same design, and adjacent wall surfaces are regulated and controlled according to actual requirements. Compared with a smooth channel, the fully-bionic S-shaped turbulent flow structure can remarkably improve the heat transfer and exchange performance of the motor radiator, large flow resistance is avoided, and the machinability is good due to the fact that no rib structure exists. Under the same fluctuation amplitude, the heat exchange performance of the channel is basically consistent, but the pressure loss of the channel relative to the S-shaped wall surface is obviously higher than that of the other two channels.

Description

Technical Field

[0001] The invention belongs to the technical field of motor radiator cooling, and in particular relates to a full-bionic S-shaped spoiler structure of a low heat load component. Background Art

[0002] During the operation of the motor, a large amount of heat energy will inevitably be generated due to the conversion of electromagnetic energy. If this heat cannot be effectively dissipated, the internal temperature of the motor will continue to rise, which will accelerate the aging of the insulation material, reduce the lubrication performance of the bearing, demagnetize the permanent magnet, and reduce the overall efficiency of the motor. Most existing radiators rely on the arrangement of a large number of metal fins to enhance heat exchange, which makes the radiator heavy and has a large pressure loss. Therefore, it is necessary to design a cooling channel that can enhance wall heat exchange with a lighter weight and less pressure loss. Summary of the invention

[0003] The purpose of the present invention is to provide a fully bionic S-shaped spoiler structure for a motor radiator, to improve the deficiencies of the prior art, to further enhance the cooling efficiency of the motor radiator, and at the same time to simplify the internal structure of the channel and reduce the manufacturing difficulty.

[0004] The present invention discloses a fully bionic S-shaped spoiler structure for a motor radiator, wherein four wall surfaces of the channel all adopt a bionic S-shaped design, two wall surfaces at relative positions adopt the same design, and adjacent wall surfaces are adjusted according to actual needs.

[0005] Furthermore, in the present invention, the fluctuation of the bionic S-shaped wall in the channel is designed to be ten cycles, the fluctuation amplitude of each cycle is set to the same size, and the length of each cycle is P.

[0006] Furthermore, in the present invention, the channel entrances are all square and equal in size, and the channel length is 10P.

[0007] Furthermore, in the present invention, the maximum fluctuation amplitude of the bionic S-shaped wall is 40%.

[0008] Furthermore, in the present invention, the positions where the maximum amplitude of the wall surface fluctuation of the full-bionic S-shaped spoiler structure of different types of full-low heat load components is obtained are the same.

[0009] Furthermore, in the present invention, the minimum flow area in the channel changes with the change of the position of the maximum fluctuation amplitude, generally showing a periodic change trend of shrinking-increasing.

[0010] Furthermore, in the present invention, the requirements for heat exchange performance of different channels can be met by adjusting the location of the maximum fluctuation value and the size of the fluctuation amplitude.

[0011] Compared with the prior art, the present invention proposes a fully bionic S-shaped spoiler structure for a motor radiator, which enhances the heat exchange effect of the inner cooling channel by designing the four walls of the motor radiator cooling channel as S-shaped walls. Compared with the traditional S-shaped channel, the fully bionic S channel improves the flow field disturbance in the near-wall area due to the increase in the number of S-shaped walls, significantly increases the mass exchange between the cold air and the mainstream near each wall, and significantly improves the heat exchange performance of the channel wall. At the same time, the intense mass transfer slightly increases the flow loss. Compared with the straight channel with continuous S ribs, the wall heat exchange intensity of the fully bionic S-shaped spoiler structure of the low heat load component still has obvious advantages, and the comprehensive heat exchange performance is also improved to a certain extent. The design of different S-shaped walls makes the mechanism of cold air enhanced heat exchange different. The increase in the average flow rate of the cold air can significantly increase the heat exchange performance, and the increase in the cold air flow rate in the local area can also achieve the target effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the traditional bionic S-shaped wall cooling channel;

[0013] Figure 2 This is a schematic diagram of a relatively bionic S-shaped wall cooling channel of the present invention;

[0014] Figure 3 This is a schematic diagram of the ectopic bionic S-shaped wall cooling channel of the present invention;

[0015] Figure 4 Schematic diagram of the staggered bionic S-shaped coupled traditional S-shaped wall cooling channel of the present invention;

[0016] Figure 5 shows the Nu / Nu of the new S-shaped wall cooling channel of the present invention and the traditional wall 0 Schematic diagram of cloud map comparison. DETAILED DESCRIPTION

[0017] The principle and working process of the present invention are further explained below in conjunction with specific implementations and drawings.

[0018] The present invention discloses a fully bionic S-shaped spoiler structure for a motor radiator, wherein the four walls of the channel are all composed of bionic S-shaped walls, the two walls in relative positions adopt the same design, and the adjacent walls are regulated according to actual needs. Compared with a smooth channel, the fully bionic S-shaped spoiler structure can significantly improve the heat transfer and heat exchange performance of the motor radiator and avoid generating a large flow resistance. The structure has good machinability due to the lack of a rib structure. Under the same fluctuation amplitude, the heat exchange performance of the channel in the present invention is basically the same, but the pressure loss relative to the S-shaped wall channel is significantly higher than that of the other two channels.

[0019] like Figure 1 to Figure 4As shown, a spoiler structure for a motor radiator is used, in which the four walls of the channel all adopt a bionic S-shaped design, the two walls in relative positions adopt the same design, and the adjacent walls are adjusted according to actual needs.

[0020] like Figure 2 to Figure 4 As shown, the fluctuation of the S-shaped wall in the full bionic S-shaped spoiler structure of the low heat load component is designed to be ten cycles, the fluctuation amplitude of each cycle is set to the same size, and the length of each cycle is P; the channel inlets are all square and equal in size, and the channel length is 10P; the maximum fluctuation amplitude of the S-shaped wall is 40%; the maximum fluctuation amplitude of the S-shaped wall of the full bionic S-shaped spoiler structure of different types of low heat load components is obtained at the same position; the minimum flow area in the channel changes with the change of the position of the maximum fluctuation amplitude; for the requirements of different channel heat exchange performance, the present invention can adapt by adjusting the position of the maximum fluctuation value and the size of the fluctuation amplitude.

[0021] The following table compares the performance of three fully bionic S-shaped spoiler structures of different shapes. Compared with the performance of smooth straight channels, it is found that the heat transfer performance of the three channels is significantly better than that of the straight channel, and the dimensionless Nusselt number of the ribbed end wall has increased by more than 170%. Compared with the straight channel with continuous S-shaped ribs, the heat transfer intensity of the three channels is still significantly superior, the dimensionless Nusselt number has increased by at least 68%, and the comprehensive heat transfer performance indicators of two of the channels have also increased to a certain extent. Compared with the traditional S-shaped channels shown in Figure 5(a), the three new bionic S-shaped channels proposed in the present invention have significantly improved heat transfer performance. Among them, the Nu / Nu of the staggered S-shaped coupled traditional S-shaped wall channel with the worst heat transfer performance is 2.34 times that of the traditional S-shaped channel. 0 It has been improved by 93%. Except for the relative S-shaped wall channel shown in Figure 5(b), the TP of the other two channels has also been improved to a certain extent. The channel with the best heat transfer performance among the three channels is the ectopic S-shaped wall shown in Figure 5(c). The maximum fluctuation of the end wall of the channel and the minimum value of the side wall appear in the same flow direction, so the minimum flow area of ​​the channel is 60% of that of the straight channel. The minimum co-flow area of ​​the relative S-shaped wall channel is only 36% of that of the straight channel, so the pressure loss of this channel is significantly higher than that of the ectopic S-shaped wall. The heat transfer and pressure loss of the staggered S-shaped coupled traditional S-shaped wall channel shown in Figure 5(d) are similar to those of the ectopic S-shaped wall channel, but the flow area is the largest among the above three channels, which provides convenience for the subsequent arrangement of ribs in the channel to further improve the heat transfer performance of the channel.

[0022] <![CDATA[Overall dimensionless Nusselt number Nu / Nu 0 > Comprehensive heat transfer performance index TP Smooth straight channel 38.915 0.254 Smooth wall coupled with continuous S-ribs 62.449 0.210 Traditional S-shaped channel 54.596 0.210 Relative S-shaped wall 107.556 0.175 Eccentric S-shaped wall 108.604 0.226 Dislocated S-shaped coupling with traditional S-shaped wall 106.525 0.216

[0023] The dimensionless Nusselt number is defined as follows:

[0024] Nu / Nu 0 =(hD / λ) / 0.023Re 0.8 Pr 0.4(1)

[0025] In the formula, h is the heat transfer coefficient, D is the characteristic length, λ is the thermal conductivity, Re is the inlet Reynolds number, and Pr is the Prandtl number. The comprehensive heat transfer performance index is defined as follows:

[0026] TP=(Nu / Nu 0 ) / (f / f 0 ) 1 / 3 (2)

[0027] where f 0 =0.507Re -0.3 f=Δp / (0.5ρU 2 ). 0 is the resistance coefficient of the circular tube with the same characteristic scale, which is used as a benchmark reference. f is the resistance coefficient of the channel with a bionic S-shaped spoiler structure, Δp is the pressure difference between the inlet and outlet of the channel with a bionic S-shaped spoiler structure, ρ is the inlet gas density of the channel with a bionic S-shaped spoiler structure, and U is the inlet flow velocity of the channel with a bionic S-shaped spoiler structure.

[0028] The above embodiments are only for illustrating the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the present invention.

Claims

1. A fully bionic S-shaped spoiler structure for a motor radiator, characterized in that: The four walls of the channel all adopt a bionic S-shaped design, and the two walls in opposite positions adopt the same design.

2. The fully bionic S-shaped spoiler structure for a motor radiator according to claim 1 is characterized in that: The fluctuation of the bionic S-shaped wall in the channel is designed to be ten cycles, the fluctuation amplitude of each cycle is set to the same size, and the length of each cycle is P.

3. The fully bionic S-shaped spoiler structure for a motor radiator according to claim 2 is characterized in that: The channel entrances are all square and equal in size, and the channel length is 10P.

4. The fully bionic S-shaped spoiler structure for a motor radiator according to claim 3 is characterized in that: The maximum fluctuation amplitude of the bionic S-shaped wall is 40%.

5. The fully bionic S-shaped spoiler structure for a motor radiator according to claim 4, characterized in that: The positions where the maximum fluctuation amplitude of the full bionic S-shaped spoiler structure of the different types of low heat load components is obtained are the same.

6. The fully bionic S-shaped spoiler structure for a motor radiator according to claim 5, characterized in that: The minimum flow area in the channel changes with the change of the position of the maximum fluctuation amplitude.

7. The fully bionic S-shaped spoiler structure for a motor radiator according to claim 1, characterized in that: The requirements of heat transfer performance of different channels can be met by adjusting the position of the maximum fluctuation value and the size of the fluctuation amplitude.

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