JP4427491B2 - Wind tunnel testing equipment - Google Patents

Description

  The present invention relates to a wind tunnel test apparatus that performs a diffusion test of a gas heavier than air (for example, a liquefied gas such as LNG or LPG).

Wind tunnel test equipment that performs diffusion tests of gas heavier than air (hereinafter referred to as “sample gas”) includes a side chamber at the lower end of the side wall of the wind tunnel measurement unit (measurement cylinder), and multiple gas outlets. (For example, refer to Patent Documents 1 and 2).
Japanese Utility Model Publication No. 60-83941 (see FIG. 3) Japanese Utility Model Publication No. 62-143238 (see FIG. 1)

  However, the side chambers and gas discharge ports disclosed in these patent documents are provided so as to protrude outward from the lower end of the side wall of the wind tunnel measurement unit. For this reason, there has been a problem that the size in the width direction of the wind tunnel measuring part (measuring cylinder) becomes large, and the apparatus becomes large.

  The present invention has been made in view of the above circumstances, and provides a wind tunnel testing apparatus that can suppress the size in the width direction of the wind tunnel measurement unit (measurement cylinder) and can reduce the size of the apparatus. With the goal.

The present invention employs the following means in order to solve the above problems.
A wind tunnel test apparatus according to the present invention is a wind tunnel test apparatus for performing a diffusion test of a gas heavier than air discharged from a gas generation source disposed on a floor surface of a measurement cylinder having a double side wall. Grooves are provided along the longitudinal direction of the measuring cylinder on both sides of the measuring cylinder.
According to such a wind tunnel test apparatus, the sample gas heavier than the air discharged from the gas generation source is diffused by the airflow passing through the measurement cylinder, but on the side of the side wall along the floor surface. The diffused (advanced) sample gas flows into the groove without being affected by the side wall, spontaneously falls, flows downstream along the groove, and is discharged outside the wind tunnel testing apparatus.
That is, as shown in FIG. 3A, the sample gas diffuses so as to travel on a flat plate having an infinite width without filling the measuring cylinder.
According to the wind tunnel test apparatus according to the present invention, as shown by a broken line (“natural fall method”) in FIG. 4, the sample gas discharged from the gas generation source can be diffused in the same manner as in the actual field. More accurate (diffusion) test results can be obtained.
In addition, the sample gas discharged from the gas generation source is allowed to fall naturally vertically downward through grooves provided on both sides of the measurement cylinder, so that the dimension in the width direction of the measurement cylinder is suppressed. As a result, the apparatus can be miniaturized.
Furthermore, according to the wind tunnel test apparatus of the present invention, the sample gas G heavier than air can be discharged out of the measurement cylinder 7 without impairing the airflow insulation effect.

Further, it is more preferable that an exhaust means is connected to the groove portion.
According to such a wind tunnel test apparatus, the sample gas that has flowed into the groove portion and naturally dropped by the exhaust means (for example, an exhaust fan) is forcibly discharged to the outside of the wind tunnel test apparatus. The unit flow rate passing through the exhaust means is set to be equal to the sample gas discharged from the gas generation source, for example.
According to such a wind tunnel test apparatus, even in a case where a large amount of test gas is released, the gas dropped into the groove is discharged outside the wind tunnel test apparatus without overflowing into the measurement cylinder. More accurate (diffusion) test results can be obtained than those not having.

Furthermore, it is more preferable that a gas supply means for supplying a gas equivalent to the gas discharged from the measurement cylinder into the measurement cylinder is provided.
According to such a wind tunnel test apparatus, air having the same amount as the fluid flow rate discharged to the outside of the measurement cylinder is supplied into the measurement cylinder via the gas supply means, so that it is perpendicular to the flow in the measurement cylinder. It is possible to keep the flow rate of the vertical cross section constant.

  ADVANTAGE OF THE INVENTION According to this invention, the dimension of the width direction of a wind tunnel measurement part (measurement cylinder) can be suppressed, and there exists an effect that size reduction of an apparatus can be achieved.

Hereinafter, a first reference embodiment of a wind tunnel testing apparatus according to the present invention will be described with reference to the drawings.
As shown in FIG. 9, the wind tunnel test apparatus 1 according to the present embodiment includes a blower 2, a diffusion drum 3, a rectifying grid 4, a contracted flow drum 5, a rectifying plate 6, a measuring drum 7, and a discharge port. 8 is the main element.
The air flow 9 created by the blower 2 becomes a well-balanced wind by the diffusion cylinder 3, the rectifying grid 4, the contracted flow cylinder 5, and the rectifying plate 6, and after entering the measuring cylinder 7 and performing a predetermined test (experiment), It is discharged from the discharge port 8 to the outside.
Further, on the floor surface 7a of the measuring cylinder 7, a gas generation source 10 for discharging a sample gas G heavier than air and a model (for example, an LNG storage facility and its surrounding terrain model) 11 are placed. .

As shown in FIGS. 1 and 2, the measuring cylinder 7 includes a floor surface 7a having a U-shape in cross section, two side walls 7b extending straight along the direction of the air flow 9, and the two side walls 7b. And a ceiling surface 7c connecting the upper ends.
Between the end surface 7d of the floor surface 7a (a surface extending in parallel with the side wall 7b) and the side wall 7b, a groove portion 7e with a bottom plate is provided along the end surface 7d and the side wall 7b (along vertically below). Yes. Although not shown, the end portion of the groove portion 7e opens to the outside of the wind tunnel testing apparatus 1.

According to the wind tunnel test apparatus 1 according to the present embodiment, the sample gas G heavier than the air discharged from the gas generation source 10 is diffused by the air flow 9, but the side of the side wall 7b along the floor surface 7a. The sample gas G diffused (progressed) flows into the groove portion 7e with the bottom plate without being influenced by the side wall 7b, and naturally falls, and along the groove portion 7e, the downstream side of the wind tunnel test apparatus 1 It is designed to be discharged outside.
That is, as shown in FIG. 3A, the sample gas G is diffused so as to travel on a flat plate having an infinite width without filling the measuring cylinder 7.
FIG. 3B shows a sample in a conventional example (for example, a wind tunnel test apparatus shown in FIG. 2 of Japanese Utility Model Laid-Open No. 60-83941) in which the lower ends of two side walls 7b are connected by a bottom surface 7a. It is a figure which shows how the gas G flows, Comprising: It turns out that the sample gas G which reached the side wall 7b is flowing downstream along the side wall 7b.

In this regard, according to the wind tunnel testing apparatus 1 according to the present embodiment, the sample gas G discharged from the gas generation source 10 is made to be the same as the actual outdoor field, as shown by a broken line (“natural fall method”) in FIG. Therefore, a more accurate (diffusion) test result can be obtained.
Further, since the sample gas G discharged from the gas generation source 10 is naturally dropped vertically downward through the groove portions 7e with the bottom plate provided on both sides of the measurement cylinder 7, the measurement cylinder 7 Therefore, the size of the apparatus can be reduced.
As shown by a solid line in FIG. 4 ("conventional example"), a conventional example in which the lower ends of two side walls 7b are connected by a bottom surface 7a (for example, as shown in FIG. 2 of Japanese Utility Model Laid-Open No. 60-83941). Since the sample gas G that has reached the side wall 7b flows downstream along the side wall 7b, the sample gas G discharged from the generation source 10 can be sufficiently diffused. It cannot be seen that a highly accurate (diffusion) test result cannot be obtained.

A second reference embodiment of the wind tunnel test apparatus according to the present invention will be described with reference to FIG.
The wind tunnel test apparatus 21 in the present embodiment is different from that in the first reference embodiment described above in that it includes an exhaust unit 22. Since other components are the same as those of the first reference embodiment described above, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as 1st reference embodiment mentioned above.

  The exhaust means (for example, exhaust fan) 22 is for forcibly discharging the sample gas G that has flowed into the groove 7 e and naturally dropped to the outside of the wind tunnel test apparatus 21, and passes through the exhaust means 22. The unit flow rate is set to be equal to the sample gas G discharged from the gas generation source 10, for example.

According to the wind tunnel test apparatus 21 according to the present embodiment, even in a case where a large amount of test gas is released, the gas dropped into the groove is released outside the wind tunnel test apparatus without overflowing into the measurement cylinder. More accurate (diffusion) test results can be obtained than those of the first reference embodiment described above.
Other functions and effects are the same as those of the first reference embodiment described above, and a description thereof is omitted here.

A third reference embodiment of the wind tunnel testing apparatus according to the present invention will be described with reference to FIGS.
The wind tunnel testing apparatus 31 in the present embodiment includes a plurality of (10 in this embodiment) gas discharge ports 32 instead of the groove portion 7e with the bottom plate, and a plurality of gas discharge ports 32 above the gas discharge ports 32. It differs from the thing of the 2nd reference embodiment mentioned above by the point provided with the air supply pipe | tube 33 (10 in this embodiment). Since other components are the same as those in the above-described embodiment, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as embodiment mentioned above.

The gas discharge port 32 is arranged at the lower end of each side wall 7b along the direction of the airflow 9 (longitudinal direction of the measurement cylinder 7), and the sample gas G that has reached each side wall 7b is exhausted (for example, The air is exhausted to the outside of the wind tunnel testing device 31 via the exhaust fan) 22.
Each gas discharge port 32 is connected to a header 35 via an exhaust pipe 34, and the header 35 is connected to the exhaust means 22 via a collecting pipe 36. A flow rate adjusting valve 37 is provided in the middle of each exhaust pipe 34.

The air supply pipe 33 is for supplying the same amount of air as the sample gas G discharged from the gas discharge port 32 into the measurement cylinder 7, and each air supply pipe 33 corresponds to the corresponding gas discharge port 32. The air supply pipes 33 extend substantially up to the vicinity of the center of the measuring cylinder 7.
Each air supply pipe 33 is connected to a header 39 via an intake pipe 38, and the header 39 is connected to a gas supply means (for example, an intake fan) 41 via a collecting pipe 40. A flow rate adjustment valve 42 is provided in the middle of each intake pipe 38, and each flow rate adjustment valve 42 is connected to the control means 43.
Further, a wind speed sensor 44 is disposed in the vicinity of the gas discharge port 32 located on the most downstream side, and the wind speed sensor 44 is connected to the control means 43. The amount of air supplied (discharged) from each air supply pipe 33 into the measuring cylinder 7 is calculated by the wind speed sensor 44 and the control means 43, and each flow rate adjustment valve 42 is appropriately set by the control means 43. It is controlled by opening and closing to the opening.

According to the wind tunnel testing apparatus 31 according to the present embodiment, the sample gas G reaching the side wall 7b can be discharged out of the measurement cylinder 7 through the gas discharge port 32, and the sample gas discharged out of the measurement cylinder 7 Since an amount of air equal to G can be supplied into the measurement cylinder 7 via the air supply pipe 33, the passage flow rate in a vertical section perpendicular to the flow in the measurement cylinder 7 can be kept constant.
Other functions and effects are the same as those of the above-described second reference embodiment, and thus description thereof is omitted here.

In addition, this invention is not limited to the thing of embodiment mentioned above, For example, the wind tunnel test apparatus 41 provided with the measurement cylinder 7 which has the inner wall 7f as shown in FIG. 8 (it has what is called a double side wall). It is also possible to apply to. In the wind tunnel test apparatus 41 including the measurement cylinder 7 having such a double side wall, the sample gas G heavier than air can be discharged out of the measurement cylinder 7 without impairing the airflow insulation effect.
Further, in the third reference embodiment, the case where a plurality of gas discharge ports 32 are provided instead of the groove 7e has been described as a specific example, but the present invention is not limited to this. Instead of the plurality of gas discharge ports 32, the same groove portion 7e as in the first reference embodiment and the second reference embodiment may be provided. As a result, the sample gas G discharged from the gas generation source 10 is allowed to fall naturally vertically downward through the groove portions 7e with the bottom plate provided on both sides of the measurement cylinder 7, so that the measurement cylinder The dimension in the width direction of 7 is suppressed.

It is a figure which shows 1st reference embodiment of the wind tunnel testing apparatus by this invention, Comprising: It is a principal part perspective view of a measurement cylinder. It is the II-II arrow sectional drawing of FIG. (A) is a sectional view taken along the line III-III in FIG. 1, and (b) is a view showing a conventional wind tunnel test apparatus, which is the same as (a). 4 is a graph for comparing (diffusion) test results obtained using the wind tunnel test apparatus shown in FIG. 3A and the wind tunnel test apparatus shown in FIG. It is a figure which shows 2nd reference embodiment of the wind tunnel test apparatus by this invention, Comprising: It is a figure similar to FIG. It is a figure which shows 3rd reference embodiment of the wind tunnel testing apparatus by this invention, Comprising: It is the whole perspective view of a measurement cylinder. FIG. 7 is a cross-sectional view taken along arrow VII-VII in FIG. 6. It is a figure which shows one Embodiment of the wind tunnel testing apparatus by this invention, Comprising: It is a figure similar to FIG. It is a general | schematic whole block diagram of the wind tunnel test apparatus provided with the measurement cylinder shown in FIG.

DESCRIPTION OF SYMBOLS 1 Wind tunnel test apparatus 7 Measuring cylinder 7a Floor surface 7e Groove part 10 Gas generation source 21 Wind tunnel test apparatus 22 Exhaust fan (exhaust means)
31 Wind tunnel test equipment 41 Intake fan (gas supply means)
51 Wind tunnel test equipment G Sample gas

Claims (3)

A wind tunnel test apparatus for performing a diffusion test of a gas heavier than air discharged from a gas generation source disposed on a floor surface of a measurement cylinder having a double side wall ,
A wind tunnel testing apparatus, wherein grooves are provided on both sides of the floor along the longitudinal direction of the measuring cylinder.   The wind tunnel testing apparatus according to claim 1, wherein exhaust means is connected to the groove.   3. A wind tunnel testing apparatus according to claim 1, further comprising gas supply means for supplying a gas equivalent to the gas discharged from the measurement cylinder into the measurement cylinder.

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