JP-2026074783-A - heat exchanger

Abstract

[Problem] To provide a heat exchanger that can suppress the increase in pressure loss caused by the heat exchanger while improving the performance of heat exchange. [Solution] In this heat exchanger, a plurality of circular tubes are arranged in parallel in a direction parallel to the direction of airflow. [Selection Diagram] Figure 1

Inventors

• 植田 達哉
• 長光 左千男

Assignees

• 住友精密工業株式会社

Dates

Publication Date

20260507

Application Date

20241021

Claims (7)

1. A heat exchanger for aircraft that exchanges heat with airflow, It has multiple circular pipes through which the fluid to be subjected to heat exchange flows, A heat exchanger in which the plurality of circular tubes are arranged in parallel in a direction parallel to the direction of airflow.
2. The heat exchanger according to claim 1, wherein a flattened pipe having a flattened cross-sectional shape in a direction parallel to the airflow direction is arranged upstream of the plurality of circular pipes.
3. The heat exchanger according to claim 1, wherein flattened pipes having a flattened cross-sectional shape parallel to the airflow direction are arranged upstream and downstream of the plurality of circular pipes.
4. The heat exchanger according to claim 1, wherein a flattened pipe having a flattened cross-sectional shape in a direction parallel to the airflow direction is arranged downstream of the plurality of circular pipes.
5. The flattened tube is positioned in contact with one of the plurality of circular tubes. The heat exchanger according to claims 2 to 4, wherein the plurality of circular tubes are arranged such that the gap distance is less than 0.25 times the diameter of the circular tube, or is 0.
6. The heat exchanger according to claims 1 to 5, wherein the number of the plurality of circular tubes is 2.
7. The heat exchanger according to claims 1 to 5, wherein the number of the plurality of circular tubes is 3.

Description

This invention relates to a heat exchanger. Conventionally, heat exchangers for aircraft that perform heat exchange with airflow are known, and these heat exchangers have multiple circular tubes through which the fluid to be heat exchanged flows (see, for example, Patent Document 1). International Publication No. 2020/012524 This is a cross-sectional view showing the main components of a heat exchanger according to Embodiments 1 to 3 of the present invention.This is a cross-sectional view showing the main components of a heat exchanger according to Embodiment 1 of the present invention.This is a cross-sectional view showing the main components of a heat exchanger according to Embodiment 2 of the present invention.This is a cross-sectional view showing the main components of a heat exchanger according to Embodiment 3 of the present invention.This graph shows the simulation results of the pressure loss of a heat exchanger according to embodiments 1 to 3 of the present invention. This is the case with two circular tubes.This graph shows the simulation results of the pressure loss of a heat exchanger according to embodiments 1 to 3 of the present invention. This is the case with three circular tubes.This graph shows the simulation results of the heat dissipation amount of a heat exchanger according to Embodiments 1 to 3 of the present invention. This is the case with two circular tubes.This graph shows the simulation results of the heat dissipation amount of a heat exchanger according to embodiments 1 to 3 of the present invention. This is the case with three circular tubes.This is a distribution diagram of Mach numbers showing the simulation results of the heat dissipation amount of a heat exchanger according to Embodiment 1 of the present invention. This case has no flattened tubes and three circular tubes.This is a distribution diagram of Mach numbers showing the simulation results of the heat dissipation amount of a heat exchanger according to Embodiment 1 of the present invention. This case has flattened tubes and three circular tubes.This is a distribution diagram of heat flux values showing the simulation results of the heat dissipation amount of a heat exchanger according to Embodiment 1 of the present invention. This case has no flattened tubes and three circular tubes.This is a distribution diagram of heat flux values showing the simulation results of the heat dissipation amount of a heat exchanger according to Embodiment 1 of the present invention. It is the case where there are flattened tubes and three circular tubes.This graph shows the simulation results of the pressure loss of a heat exchanger according to Embodiment 1 of the present invention. It shows the effect of the gap distance between the three circular pipes.This graph shows the simulation results of the pressure loss of a heat exchanger according to Embodiment 2 of the present invention. It shows the effect of the gap distance between the three circular pipes.This graph shows the simulation results of the pressure loss of a heat exchanger according to Embodiment 3 of the present invention. It shows the effect of the gap distance between the three circular pipes. The embodiments of the present invention will be described below with reference to the drawings. In the following description, the same reference numerals will be used for identical components, and their descriptions may be omitted. Figure 1 is a cross-sectional view showing the main components of the heat exchanger unit of the present invention, and is a schematic diagram of the basic heat exchanger 20. The heat exchanger 20 is an air heat exchanger that performs heat exchange between the internal fluid flowing through the internal heat transfer tubes 30 and the air. The internal fluid flowing through the heat transfer tubes 30 may be, for example, hydrogen, fluorocarbons, hydrocarbons, or water. The heat exchanger 20 has multiple heat transfer tubes 30. In the following description, these multiple heat transfer tubes 30 may be referred to as heat transfer tubes 30A, 30B, 30C, 30D, and 30E, in order from left to right in Figure 1. Multiple heat transfer tubes 30 are arranged in parallel to each other. The direction of parallel arrangement of the heat transfer tubes 30 is, for example, parallel to the airflow direction (the x-direction). Here, we assume that the airflow flows from the negative x-direction to the positive x-direction, that is, from left to right in the diagram. The same applies throughout. Furthermore, the parallel direction of the multiple heat transfer tubes 30 is perpendicular to the extension direction (z-direction) of the heat transfer tubes 30. The multiple heat transfer tubes 30 are sandwiched between a pair of headers. One end of each heat transfer tube 30 is connected to one header, and the other end of each heat transfer tube 30 is connected to the other header. The longitudinal direction of each header is the same as the parallel direction of the multi