JP5321339B2 - Model pressure loss setting method, model pressure loss adjustment structure, and fluid test model - Google Patents

Description

  The present invention relates to a model pressure loss setting method, a model pressure loss adjusting structure, and a fluid test model used in a fluid test such as a wind tunnel test of an automobile or the like.

  In order to grasp the flow of air (wind) generated in actual objects such as automobiles, bridges, and buildings, model tests using a wind tunnel are being conducted. In addition, in order to grasp the flow of water generated in actual objects such as ships, offshore structures and embankments, model tests using circulating water tanks and water tanks are performed.

  The air flow in the wind tunnel test includes a flow that flows outside the model and a flow that flows inside the model. This internal flow is called ventilation, and it is a ventilation resistor that hinders ventilation. In order to bring the air flow inside the model closer to the actual flow, the setting of the ventilation resistor is important.

  However, in this ventilation resistor, as shown in FIG. 4, since the relationship between the air volume and the pressure becomes nonlinear, it is difficult to select and set an appropriate ventilation resistor. Therefore, as shown in FIGS. 5 and 6, the ventilation resistor is formed by combining the metal mesh that is the resistance adjusting members 11 and 12 for adjusting the resistance and the honeycomb material 14 that supports the resistance adjusting members 11 and 12. Attempts have been made to adjust the pressure loss of the model pressure loss adjusting structure 10X.

  The method shown in FIGS. 5 and 6 does not necessarily provide the model pressure loss adjusting structure 10X having an appropriate resistance characteristic with respect to the desired resistance characteristic. Even in this case, a great deal of labor is often required before the model pressure loss adjusting structure 10X can be set. As a result, not only does the model test take time, but the subsequent steps using the model test results are also affected.

  In general, since thin plate-like members are used for the resistance adjusting members 11 and 12 used in the model pressure loss adjusting structure 10X, the mechanical strength is relatively weak, and the resistance adjusting members 11 and 12 are provided upstream and downstream. When the is disposed, a support member 14 for supporting these resistance adjusting members 11 and 12 is required between them.

  In many cases, a honeycomb material is used for the support member 14, but in this case, the resistance characteristic of the support member 14 sandwiched therebetween affects the resistance characteristics of the set resistance adjusting members 11 and 12. As shown in FIG. 7, the pressure loss increases. Therefore, it is necessary to set the thickness of the resistance adjusting members 11 and 12 in consideration of the resistance characteristics of the honeycomb material 14. Therefore, it is difficult to set the thickness of the resistance adjusting members 11 and 12 and the thickness of the support member 14 having different flow characteristics from the resistance adjusting members 11 and 12 while the overall thickness is set by the model 1. There is a problem of becoming.

  In this model, the ventilation resistance replaces the pressure loss required for the model with the pressure loss of the resistance adjusting members 11 and 12 and the support member 14, and further, the structure for adjusting the pressure loss of the model (resistor model). The thickness of 10 needs to be matched to the scale of the model. The resistance adjusting members 11 and 12 usually formed of a metal mesh or the like are thin, and the thickness of the model pressure loss adjusting structure 10 cannot be adjusted to the required thickness by itself. Further, even if the model pressure loss adjusting structure 10 is made of several types of materials to increase the thickness and obtain the required thickness, the required resistance characteristics are not necessarily satisfied. Not exclusively. Therefore, it is difficult to satisfy the requirements of both resistance characteristics and thickness, and there is a problem that much labor is required to model the entire model pressure loss adjusting structure 10 at once.

  Further, as shown in FIG. 8, the resistance adjusting member 12 provided on the downstream side of the support member 14 may be bent by the wind pressure, and a gap S may be formed between the resistance adjustment member 12 and the support member 14. In such a case, since the thickness of the resistance adjusting member 12 along the flow of the wind changes due to the bending, the pressure characteristics of the model pressure loss adjusting structure 10X as a whole also change. There is also a problem that there is a discrepancy from the result of calculation.

  Although not related to this wind tunnel test and other model tests that take into consideration the draft resistance, in relation to this wind tunnel test, in the ground model for the diffusion concentration investigation wind tunnel test of automobile exhaust gas, it is continuously discharged from the automobile running on the road. A surface model that accurately reproduces exhaust gas is proposed (see, for example, Patent Document 1).

  In addition, the airflow acting on the support device for supporting and turning the model in the wind tunnel reduces the effect of the airflow on the model's aerodynamic characteristics, and further reduces the center of the model at the time of turning the model without losing the similarity of the model. There has been proposed a wind tunnel test model support device that reduces the movement of (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 10-232182 Japanese Patent Laid-Open No. 06-307978

  As a countermeasure against this, as shown in FIG. 9 and FIG. 10, in order to adjust the pressure loss of the fluid F flowing inside the model 1Y used in the test using the fluid F, the fluid F is disposed inside the model 1Y. In the model pressure loss adjusting structure 10Y in which the resistance adjusting members 11 and 12 that generate pressure loss as resistance to the flow are arranged, the resistance adjusting members 11 and 12 are formed in a plate shape, and the resistance adjusting member Without providing a support member for holding 11, 12, a part of one or a plurality of the resistance adjusting members 11 is bent to form a box shape with respect to a cross section along the flow direction of the fluid F, The resistance adjusting members 11a and 12 arranged in the portion corresponding to the side of the box shape may be arranged inside the model 1Y so as to be arranged on the upstream side and the downstream side of the flow of the fluid F, respectively. Conceivable

  However, when the resistance adjusting members 11 and 12 having different mechanical strengths are employed on the upstream side and the downstream side, as shown in FIG. 11, the upstream side resistance adjusting member 11 and the downstream side resistance adjusting member 12 are used. Therefore, the thickness of the combination of the resistance adjusting members 11 and 12, that is, the accumulated thickness of the resistance adjusting members 11 and 12 in the direction in which the fluid F passes may not be constant.

  The present invention has been made in view of the above situation, and an object of the present invention is to provide resistance adjusting members on the upstream side and the downstream side (front and rear) with respect to the flow of fluid such as wind, and to have a gap between them. Model pressure loss adjustment structure (resistor model) for model pressure loss can be easily set to the desired resistance characteristics and thickness, and at the same time, the resistance of the resistance adjustment member can be prevented from being bent. Another object is to provide a model pressure loss adjusting structure and a fluid test model.

  In order to achieve the above object, the pressure loss adjusting method of the model of the present invention is arranged inside the model in order to adjust the pressure loss related to the fluid flowing in the model used in the test using the fluid. A model in which resistance adjusting members that generate pressure loss as resistance to the fluid flow are arranged on the upstream side and the downstream side of the fluid flow, respectively, and a gap is provided between both resistance adjusting members. The pressure loss adjusting structure is adjusted so that the pressure loss necessary for the model is generated by adjusting the pressure characteristics and thickness of both resistance adjusting members, and the thickness required for the model is adjusted by adjusting the width of the gap. In the pressure loss adjustment method of the model to be adjusted to, the target unit thickness calculated from the thickness required for the model and the required pressure loss with respect to the unit thickness of the upstream resistance adjusting member The pressure loss with respect to the unit thickness of the downstream resistance adjusting member is larger than the pressure loss with respect to the target unit thickness, and the thickness of the upstream resistance adjusting member is further reduced It is a method characterized by making it larger than the thickness of the resistance adjusting member on the side.

  That is, the resistance adjusting member disposed before and after the model (model) is configured by a single member or a member in which a plurality of materials are in close contact with each other, and the pressure of the fluid is configured to continuously change therein. For the resistance adjustment member provided at the front part, a material having a pressure loss gradient gentler than the target pressure loss gradient is selected to increase the thickness of the resistance adjustment member and make it difficult to bend. In addition, the pressure loss necessary for the entire pressure loss adjusting structure of the model is distributed to the resistance adjusting members arranged on the front and rear surfaces, and the width of the gap is adjusted so as to have the required thickness. .

  According to the pressure loss adjusting method of this model, since the upstream resistance adjusting member is configured to be thick, it is difficult for the fluid pressure to be bent. In addition, a desired pressure loss can be generated with a relatively simple structure, and the thickness in the flow direction can be easily set to a desired thickness.

  In particular, since the thickness of the pressure loss adjusting member for the model is adjusted by the width of the gap portion, it is not necessary to select the pressure loss adjusting member so that the thickness of the pressure loss adjusting member becomes the thickness of the model. The pressure characteristic measured in advance for the thickness and combination of the loss adjusting member can be used, and the time and effort for measuring the resistance can be saved when creating the model.

  In addition, because the model pressure loss adjustment structure (resistor model) that satisfies the thickness requirements necessary for the model can be set, the pressure of the model that matches the pressure loss characteristics with the desired pressure loss characteristics with respect to the flow velocity. A loss adjustment structure can be created, and the accuracy of the result in the analytical calculation at the time of comparative verification can be improved.

  Therefore, the required pressure loss can be obtained while satisfying the required thickness of the entire model pressure loss adjusting structure. Furthermore, since the resistance adjusting member at the front portion is configured to be thick so that bending due to fluid pressure is less likely to occur, it is not necessary to take special measures for preventing bending.

  In the pressure loss adjusting method of the above model, as the resistance adjusting member, a resistor whose pressure loss changes by a flow from the front side and a flow from the back side, a resistor having a single layer structure, a resistor having a three-dimensional network structure When any one of these or a combination thereof is used, the resistance characteristic of the model pressure loss adjusting structure can be adjusted more easily and more closely to the required resistance characteristic.

  In addition, the structure for adjusting the pressure loss of the model of the present invention for achieving the above-described object is provided in order to adjust the pressure loss related to the fluid flowing in the model used in the test using the fluid. The resistance adjusting members that are disposed in the flow path and generate pressure loss due to resistance to the fluid flow are disposed on the upstream side and the downstream side of the fluid flow, respectively, and a gap is provided between both resistance adjusting members. In the pressure loss adjusting structure of the model configured as described above, the pressure loss with respect to the unit thickness of the upstream resistance adjusting member is the thickness required for the model and the target unit thickness calculated from the required pressure loss. The pressure loss with respect to the unit thickness of the downstream side resistance adjusting member is made larger than the pressure loss with respect to the target unit thickness, and the upstream side resistance is further reduced. It constituted the thickness of the integer member is made larger than the thickness of the downstream resistance adjusting member.

  According to this configuration, the thickness of the upstream resistance adjusting member is increased, so that bending due to fluid pressure is less likely to occur. In addition, a desired pressure loss can be generated with a relatively simple structure, and the thickness in the flow direction can be easily set to a desired thickness.

  In particular, since the thickness of the pressure loss adjusting member for the model is adjusted by the width of the gap portion, it is not necessary to select the pressure loss adjusting member so that the thickness of the pressure loss adjusting member becomes the thickness of the model. The pressure characteristic measured in advance for the thickness and combination of the loss adjusting member can be used, and the time and effort for measuring the resistance can be saved when creating the model.

  In addition, because the model pressure loss adjustment structure (resistor model) that satisfies the thickness requirements necessary for the model can be set, the pressure of the model that matches the pressure loss characteristics with the desired pressure loss characteristics with respect to the flow velocity. A loss adjustment structure can be created, and the accuracy of the result in the analytical calculation at the time of comparative verification can be improved.

  In the pressure loss adjusting structure of the above model, the resistance adjusting member includes a resistor whose pressure loss changes depending on a flow from the front side and a flow from the back side, a resistor having a single layer structure, and a three-dimensional network structure. When formed with one of these resistors or a combination of these, the resistance characteristics of the model pressure loss adjustment structure can be adjusted more easily and more closely to the required resistance characteristics. Become.

  In order to achieve the above object, a fluid test model of the present invention includes the pressure loss adjusting structure of the above model.

  According to the model pressure loss setting method, model pressure loss adjustment structure, and fluid test model used in fluid tests such as wind tunnel tests for automobiles according to the present invention, the resistance on the upstream side (front surface) Since the adjustment member is formed thick, it is difficult for the fluid pressure to bend.

  In addition, since the structure for adjusting the pressure loss of the model can be set so as to have the desired pressure characteristics without being influenced by the thickness required for the dimensions of the model, the degree of freedom in selecting the material with respect to the resistance adjustment member is increased. A model pressure loss adjusting structure (resistor model) having a desired resistance characteristic can be easily manufactured.

  And, since the structure for adjusting the pressure loss of the model that satisfies the thickness requirement necessary for the model can be manufactured, the model has a pressure loss characteristic that matches the desired pressure loss characteristic with respect to the flow velocity. The accuracy of the result in the calculation can be improved.

It is the typical assembly figure showing the composition of the structure for pressure loss adjustment of the model of the embodiment concerning the present invention. It is the typical sectional side view which showed the structure of the structure for pressure loss adjustment of the model of FIG. It is a figure which shows the pressure loss inside the structure for pressure loss adjustment of the model of FIG. It is a figure which shows the relationship between the wind speed by the structure for pressure loss adjustment of a model (ventilation resistance body), and pressure loss. It is the typical assembly figure which showed the structure of the structure for pressure loss adjustment of the model of a prior art. It is the typical sectional side view which showed the structure of the structure for pressure loss adjustment of the model of a prior art. It is a figure which shows the relationship between the wind speed and pressure loss which showed the raise of the pressure loss by a supporting member. It is the typical sectional side view which showed the gap | interval which generate | occur | produced by the bending by the wind pressure in the pressure loss adjustment structure of the model of a prior art. It is the typical assembly figure showing the composition of the structure for pressure loss adjustment of the model of the improvement invention. It is the typical sectional side view which showed the structure of the structure for pressure loss adjustment of the model of improved invention. It is the typical sectional side view which showed the bending moment and bending which arise in the structure for pressure loss adjustment of the model of improved invention.

  Hereinafter, a model pressure loss setting method according to an embodiment of the present invention will be described with reference to the drawings. In the following description, a model in a wind tunnel test will be described as an example. However, the present invention is not limited to this wind tunnel test, and can be applied to a model in a circulating water tank or water tank test.

  A model pressure loss setting method, a model pressure loss adjusting structure, and a fluid test model according to an embodiment of the present invention will be described with reference to FIGS.

  First, the pressure loss adjusting structure 10 of the model according to the embodiment of the present invention will be described. As shown in FIGS. 1 and 2, the pressure loss adjusting structure 10 of this model is used for adjusting the pressure loss of the air F flowing inside the model 1 used in the wind tunnel test using the air (fluid) F. In the housing 2 of the model 1, resistance adjusting members (ventilating resistors) 11 and 12 that generate a pressure loss as a resistance to the flow of the air F are disposed on the upstream side with the gap 3 interposed therebetween. Each is arranged on the downstream side.

  As the resistance adjusting members 11 and 12, it is sufficient that the material forming the resistance adjusting member is in close contact and exhibits a continuous characteristic within the thickness. Therefore, the pressure loss varies depending on the flow from the front side and the flow from the back side. Any of a resistor, a resistor having a single layer structure, a resistor having a three-dimensional network structure, or a combination thereof can be used. Specific examples include a metal mesh, a laminate thereof, and a metal foam. The resistance adjusting members 11 and 12 are formed in a plate shape.

  Next, a model pressure loss setting method in the model pressure loss adjusting structure 10 of FIGS. 1 and 2 will be described.

  In this model pressure loss setting method, the resistance adjusting members 11 and 12 are arranged on the upstream side and the downstream side of the flow of the air F, respectively, and the gap portion 3 is provided between both the resistance adjusting members 11 and 12. And the amount of pressure loss required for the model 2 is set based on the pressure characteristics and thicknesses t1 and t2 of both resistance adjusting members 11 and 12, and the thicknesses t1 and t2 of both resistance adjusting members 11 and 12 are The width Bs of the gap 3 is set so that the sum of the widths Bs of the gap 3 becomes a thickness tt required for the pressure loss adjusting structure 10 of the model.

  Further, the pressure loss ΔP1 with respect to the unit thickness of the resistance adjusting member 11 on the upstream side is made smaller than the pressure loss ΔPt with respect to the target unit thickness calculated from the thickness tt required by the model 1 and the required pressure loss Pt. At the same time, the pressure loss ΔP2 with respect to the unit thickness of the downstream resistance adjusting member 12 is formed to be larger than the pressure loss ΔPt with respect to the target unit thickness. Furthermore, the thickness t1 of the upstream resistance adjusting member 11 is made larger than the thickness t2 of the downstream resistance adjusting member 12.

  That is, the resistance adjusting members 11 and 12 disposed before and after the model 1 are formed by laminating a single material or a plurality of materials that become resistance, and the pressure continuously changes inside the resistance adjusting members 11 and 12. Configure as follows. The resistance adjusting member 11 provided on the upstream side, that is, the front portion, is selected to have a gentler pressure gradient than the target pressure characteristic, and the thickness t1 of the resistance adjusting member 11 is increased. The required pressure loss Pt of the entire model pressure loss adjusting structure 10 is distributed and supported by the resistance adjusting members 11 and 12 arranged on the front and rear surfaces, and the necessary thickness of the pressure loss adjusting structure 10 is obtained. tt is adjusted by the width Bs of the gap 3.

  By setting in this way, it is possible to set the required pressure loss Pt with the thickness tt required for the model pressure loss adjusting structure 10 as a whole. In addition, since the resistance adjustment member 11 on the upstream side, that is, the front portion has a relatively large thickness t1, it is difficult for the resistance adjustment member 11 to bend due to fluid pressure. There is no need. Although the downstream side, that is, the rear side resistance adjusting member 12 has a relatively small thickness t2, the fluid pressure acting on the downstream side resistance adjusting member 12 is reduced by the upstream side resistance adjusting member 11, so that the fluid pressure depends on the fluid pressure. Bending is less likely to occur.

  According to this method, since the thickness t1 of the upstream resistance adjusting member 11 is increased, the bending due to the fluid pressure hardly occurs. In addition, a desired pressure loss can be generated with a relatively simple structure, and the thickness tt in the flow direction can be easily set to a desired thickness. In particular, since the thickness tt of the model pressure loss adjusting structure 10 is adjusted by the width Bs of the gap 3, the sum of the thicknesses t1 and t2 of the pressure loss adjusting members 11 and 12 becomes the model thickness tt. It becomes unnecessary to select the pressure loss adjusting members 11 and 12, and the pressure characteristics measured in advance for the thicknesses t1 and t2 and combinations of the various pressure loss adjusting members 11 and 12 can be used. It is possible to save the trouble of measuring.

  In addition, since the structure (resistor model) 10 for adjusting the pressure loss of the model that satisfies the thickness requirement necessary for the model can be set, the characteristics of the pressure loss with respect to the flow velocity are matched with the characteristics of the desired pressure loss. The pressure loss adjusting structure 10 can be created, and the accuracy of the result in the analytical calculation at the time of comparative verification can be improved.

  More specifically, as shown in FIG. 3, the material of the upstream side resistance adjusting member 11 has a pressure gradient ΔP <b> 1 (pressure gradient shown by “model” in FIG. 3) with respect to the unit thickness, which adjusts the pressure loss of the model. From the pressure gradient (desired pressure loss (Pt) / pressure loss adjusting structure thickness (tt)) ΔPt (pressure gradient indicated by “target” in FIG. 3) required for the structural body 10 Choose a small and gentle one.

  On the other hand, as shown in FIG. 3, the material of the resistance adjusting member 12 on the downstream side has a pressure gradient ΔP2 (pressure gradient shown by “model” in FIG. 3) with respect to the unit thickness. 10 and a pressure gradient (desired pressure loss (Pt) / pressure loss adjusting structure thickness (tt)) ΔPt (pressure gradient indicated by “target” in FIG. 3) with respect to the unit thickness. Choose what.

  The thickness t1 of the resistance adjusting member 11 is set to a thickness that allows the deflection amount to be within an allowable range with respect to the wind pressure (fluid pressure), and the thickness t1 is equal to the pressure loss ΔP1 with respect to the unit thickness of the material of the resistance adjusting member 11. And the pressure loss P1 due to the resistance adjusting member 11 is calculated. This pressure loss P1 is subtracted from the desired pressure loss Pt to calculate the pressure loss P2 to be generated in the downstream resistance adjusting member 12.

  The pressure loss P2 is divided by the pressure loss ΔP2 with respect to the unit thickness of the material of the downstream resistance adjusting member 12, thereby calculating the thickness t2 of the downstream resistance adjusting member 12. With this thickness t2, it is confirmed that the amount of deflection of the resistance adjusting member 11 is within an allowable range with respect to the wind pressure (fluid pressure). If the amount of deflection of the resistance adjusting member 11 is not within the allowable range, the material of the resistance adjusting member 12 on the downstream side is selected again.

  Then, after the amount of deflection of the resistance adjusting member 11 falls within the allowable range, the sum of the thickness t1 of the resistance adjusting member 11 and the thickness t2 of the resistance adjusting member 12 is subtracted from the desired thickness tt, The width Bs is calculated. That is, Bd = tt− (t1 + t2).

  When the sum of the thickness t1 of the resistance adjusting member 11 and the thickness t2 of the resistance adjusting member 12 is larger than the desired thickness tt, the material of the resistance adjusting members 11 and 12 is selected again, and the thicknesses t1 and t2 and the gap are again selected. The width Bs of the part 3 is recalculated.

  As shown in FIG. 1, the resistance adjusting member 11 on the upstream side and the resistance adjusting member 12 on the downstream side are arranged with the thickness t1, t2 of the resistance adjusting members 11, 12 and the width Bs of the gap 3. Thus, the model pressure loss adjusting structure 10 is constructed. As a result, a model pressure loss adjusting structure 10 having a pressure loss (solid line indicated by “model”) as shown in FIG. 3 can be manufactured. A dotted line indicated by “target” in FIG. 3 indicates the pressure gradient ΔPt of the desired pressure loss Pt.

  According to this configuration, a desired pressure loss Pt can be generated with a relatively simple structure, and the thickness in the flow direction can be easily set to the desired thickness tt. Further, since the thickness of the pressure loss adjusting member 10 of the model can be adjusted by the width Bs of the gap portion 3, the resistance adjusting member 11 is set so that the sum of the thicknesses t1 and t2 of the resistance adjusting members 11 and 12 becomes the thickness tt of the model. , 12 need not be selected, and the pressure characteristics measured in advance for the thicknesses t1, t2 and combinations of the various resistance adjusting members 11, 12 can be used. Can be omitted.

  In addition, since the model pressure loss adjusting structure (resistor model) 10 that satisfies the thickness requirement necessary for the model 1 can be set, the pressure loss characteristic with respect to the flow velocity matches the desired pressure loss characteristic. The loss adjustment structure 10 can be manufactured, and the accuracy of the result in the analytical calculation at the time of comparative verification can be improved.

  In the model pressure loss setting method, model pressure loss adjustment structure, and fluid test model of the present invention, the thickness of the resistance adjustment member on the upstream side (front surface part) is formed thick, so that the deflection due to the fluid pressure does not occur. Since the structure for adjusting the pressure loss of the model can be set to achieve the desired pressure characteristics regardless of the thickness required for the dimensions of the model, the degree of freedom of material selection for the resistance adjustment member The pressure loss adjusting structure (resistor model) having a desired resistance characteristic can be easily manufactured.

  Therefore, the model pressure loss setting method, model pressure loss adjustment structure, and fluid test model of the present invention are used in cavity tests, circulating water tank tests, water tank tests, etc. for automobiles, aircraft, buildings, etc. It can be used as a model pressure loss setting method, a model pressure loss adjusting structure, and a fluid test model.

DESCRIPTION OF SYMBOLS 1 Model 2 Housing 3 Gap part 10, 10X, 10Y Model pressure loss adjustment structure 11, 12 Resistance adjustment member 14 Support member Bs Width of gap part F Air (fluid)
P1 Pressure loss due to upstream resistance adjustment member P2 Pressure loss due to downstream resistance adjustment member Pt Desired pressure loss required for model ΔP1 Pressure loss per unit thickness of upstream resistance adjustment member (pressure gradient)
ΔP2 Pressure loss per unit thickness of the resistance adjustment member on the downstream side (pressure gradient)
ΔPt Pressure loss per unit thickness (pressure gradient) calculated from the desired pressure loss and thickness required for the model
t1, t2 Resistance adjustment member thickness tt Desired thickness required for model pressure loss adjustment structure

Claims (5)

  In order to adjust the pressure loss related to the fluid flowing inside the model used in the test using the fluid, a resistance adjusting member which is disposed inside the model and becomes a resistance to the flow of the fluid to generate a pressure loss is provided. This is a model pressure loss adjustment structure that is arranged on both the upstream side and the downstream side of the sheet, and that is configured by providing a gap between both resistance adjustment members. Adjustment of pressure characteristics and thickness of both resistance adjustment members In the pressure loss adjustment method for a model, the unit thickness of the resistance adjusting member on the upstream side is adjusted so as to generate a pressure loss necessary for the model by adjusting the width of the gap to the thickness required for the model. The pressure loss with respect to the thickness required in the model and smaller than the pressure loss for the target unit thickness calculated from the required pressure loss, and the downstream resistance adjusting unit The pressure loss with respect to the unit thickness is made larger than the pressure loss with respect to the target unit thickness, and the thickness of the upstream resistance adjusting member is made larger than the thickness of the downstream resistance adjusting member. Model pressure loss setting method.   As the resistance adjusting member, a resistor whose pressure loss is changed by a flow from the front side and a flow from the back side, a resistor having a single layer structure, a resistor having a three-dimensional network structure, or a combination thereof is used. The method for setting a pressure loss of a model according to claim 1. In order to adjust the pressure loss related to the fluid flowing inside the model used in the test using the fluid, a resistance adjusting member which is disposed inside the model and becomes a resistance to the flow of the fluid to generate a pressure loss is provided. In the structure for pressure loss adjustment of the model, which is arranged on each of the upstream side and the downstream side of the model and is configured by providing a gap between both resistance adjustment members,
The pressure loss with respect to the unit thickness of the resistance adjusting member on the upstream side is made smaller than the pressure loss with respect to the target unit thickness calculated from the thickness required in the model and the required pressure loss, and the resistance on the downstream side The pressure loss with respect to the unit thickness of the adjustment member is made larger than the pressure loss with respect to the target unit thickness, and the thickness of the resistance adjustment member on the upstream side is made larger than the thickness of the resistance adjustment member on the downstream side. Model for pressure loss adjustment of model.   The resistance adjusting member is formed of a resistor whose pressure loss changes depending on a flow from the front side and a flow from the back side, a resistor having a single layer structure, a resistor having a three-dimensional network structure, or a combination thereof. The structure for adjusting the pressure loss of the model according to claim 3, wherein   A model for fluid testing, comprising the pressure loss adjusting structure for a model according to claim 3 or 4.

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