JPS5850305A - Fluid speed distribution setting device - Google Patents

Abstract

PURPOSE:To accurately set speed distribution of fluid by providing a honeycomb structure in a flow passage of the fluid and putting distribution of the length of through holes of said structure in correspondence to speed distribution of the fluid. CONSTITUTION:Many through holes 7 of a honeycomb structure 8 have the function of fractionizing a flow 1 of a fluid into a large number of slender flow sections in the direction of its course and letting them pass. The honeycomb structure 8, fitted between a base board 3 and a top board 4, has four sides in the direction of the flow which are L, L, L, L in the length respectively. The rear end face of the structure 8 is provided perpendicularly to a flow passage and any flow speed distribution may be obtained by adjusting distribution of the length of a large number of through holes 7 of the honeycomb structure 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for setting the velocity distribution of a fluid to a new distribution state in a wind tunnel or the like.

A conventional fluid velocity distribution setting device is not shown in Figure 1.
In the figure, they are numbered 1 from the left (/
? 'lWhen there is a uniform flow flowing, in order to change it to a flow with a required velocity distribution as shown by the symbol 2 to the right, conventionally, the bottom plate 3 and the top plate 4 of the flow path are In between, a perforated plate 6 having a plurality of thin partition plates 5 is provided, and as shown in FIG. , , v2, holes with mutually different inner diameters d, , d2 were formed.

However, with such a conventional speed distribution setting device, d
], it is necessary to drill rows of holes with various inner diameters in the perforated plate 6, and it is still necessary to provide a partition plate 5 for each row of holes with the same inner diameter, which causes the problem that the structure becomes extremely complicated.

The present invention attempts to solve this problem, and by using a two-carrier structure consisting of a collection of elongated holes, it is possible to easily meet the required requirements with a simple structure. An object of the present invention is to provide a device that allows setting of the fluid velocity D.

For this reason, in the fluid velocity distribution setting device of the present invention, a large number of through holes are provided in the fluid flow path to divide the fluid flow into seven subdivisions into a large number of elongated flow sections in the direction of movement. Equipped with a formed structure, the same...
In order to set the velocity distribution in the cross section of the flow path of the fluid after passing through the Nicomb structure to a desired distribution state, -1-
Note: The two-quad structure is characterized in that the length distribution of the through holes is determined in accordance with the velocity distribution of the fluid.

Hereinafter, a fluid velocity distribution setting device as an embodiment of the present invention will be explained with reference to the drawings. FIG. In order to change the flow 2 to a flow 2 having a velocity distribution of There is.

The large number of through holes 7 in this two-cam structure 8 have the function of dividing the fluid flow 1 into a large number of long flow sections (in the direction of movement) and passing the fluid through the bottom plate 3 and the upper Face plate 4
The length of the four sides of the nicum structure 8 in the flow direction is approximately 2'l-L, , L2
．． The rear end surface of the cam structure 8 is disposed perpendicular to the flow path.

Then, the length A1.t1□+ of each through hole 7 is adjusted accordingly so that the flow 2 after passing through each through hole 7 has the required velocity distribution τII + v+2 + ”+3 +υ1.
The distribution of lA9 + 4,1... is determined.

The reason is that each fluid velocity τ old υ12. 3+'v+4 and the corresponding length A1 of each through hole 7. A2. A3,4
This is because 4 has the following relationship.

4+ 'A2' As: 44-? 'l”4:
? '+'a: ? '+%: 1) 121, that is,
The square root of the length of each through hole 7 and the corresponding flow velocity are inversely proportional to each other. Thus, according to the device of the invention, a large number of through holes 7 in the honeycomb structure 8 By adjusting the length distribution of , any flow velocity distribution can be obtained.

In the conventional device, the inner diameter of the hole shown in Fig. 2 is d, d,
, the jet stream expands to the partition plate 5 according to the
Although it is necessary to form flow path sections using the partition plates 5 at a level where there are no peaks in the velocity distribution, in the device of the present invention, each flow path section formed by each through hole 7 of the honeycomb structure 8 has a flow rate adjustment function. This has the advantage that the velocity distribution of the fluid is formed smoothly.

And, since the length distribution of the through holes 7 can be set freely,
It has the advantage of being able to freely set the flow velocity distribution in the cross section of the flow channel two-dimensionally, which is much more advantageous than conventional devices that can only change the flow velocity distribution one-dimensionally.

Furthermore, in the conventional device, the flow velocity distribution is determined in proportion to the square of the hole diameter d, d2, so the machining accuracy of the holes in the perforated plate 6 is strictly required, whereas the device of the present invention Since the flow velocity distribution is determined in inverse proportion to the square root of the length of each through hole 7, a good flow velocity distribution can be obtained even with relatively rough machining.

As described in detail above, according to the fluid velocity distribution setting device of the present invention, in the fluid flow path, the fluid flow is segmented into a large number of elongated flow sections in the direction of movement and passes through a large number of parallel through holes. In order to set the velocity distribution of the fluid in the cross section of the flow path to a desired distribution state after passing through the honeycomb structure, This simple structure has the advantage that the length distribution of the through holes is determined in accordance with the velocity distribution of the fluid, and the velocity distribution of the fluid can be set extremely accurately.

[Brief explanation of the drawing]

Figures 1 and 2 show a conventional fluid velocity distribution setting device, with Figure 1 being a perspective view showing its schematic structure, Figure 2 being an enlarged sectional view of its main parts, and Figure 3 1 is a perspective view showing a fluid velocity distribution setting device as an embodiment of the present invention. ]... Uniform flow, 2... Flow with velocity distribution, 3...
Bottom plate, 4...'' - Face plate, 5... Partition plate, 6... Perforated plate, 7... Through hole, 8... Honeycomb structure. Sub-Agent Patent Attorney Yoshihiko Iinuma

Claims (1)

[Claims] In the fluid flow path, the fluid flow is divided into a large number of elongated flow sections in the direction of movement of the fluid, and is provided with a nicum structure formed with a large number of parallel through holes.
In order to set the velocity distribution in the cross section of the flow path of the I- fluid after passing through the two-cam structure and ZC to the required distribution state, the distribution of the length of the through hole in the two-cam structure is A fluid velocity distribution setting device, characterized in that the fluid velocity distribution setting device is determined in accordance with the velocity distribution of the fluid.