JP5321342B2 - 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. 6, 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 FIG. 7 and FIG. 8, a ventilation resistor is formed by combining a metal mesh that is resistance adjusting members 11 and 12 for adjusting resistance and a 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.

  In the method as shown in FIGS. 7 and 8, it is not always possible to provide the model pressure loss adjusting structure 10X having the 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. 9, 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 in the total thickness set by the model 1X. There is a problem of becoming.

  In this model 1X, the ventilation resistance replaces the pressure loss required for the model 1X with the pressure loss of the resistance adjusting members 11, 12 and the support member 14, and further, the model pressure loss adjusting structure (resistor) Model) The thickness of 10X must 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 10X cannot be adjusted to the required thickness by itself.

  Further, even if the model pressure loss adjusting structure 10X is made to have the required thickness by increasing the number of layers using several kinds of materials to obtain the required thickness, the required resistance characteristics are not necessarily satisfied. Not exclusively. Therefore, it is difficult to satisfy both requirements of resistance characteristics and thickness, and there is a problem that much effort is required to model the entire model pressure loss adjusting structure 10X at once.

  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

  Therefore, as shown in FIGS. 10 to 12, the present inventors are arranged inside the model 1Y in order to adjust the pressure loss related to the fluid F flowing inside the model 1Y used in the test using the fluid. The resistance adjusting members 11 and 12 that generate a pressure loss as a resistance to the flow of the fluid F are arranged on the upstream side and the downstream side of the flow of the fluid F, respectively, and between the resistance adjusting members 11 and 12. In the model pressure loss adjusting structure 10Y configured by providing the gap 3, the pressure loss necessary for the model 1Y is generated by adjusting the pressure characteristics and the thicknesses t1 and t2 of the resistance adjusting members 11 and 12. In the method for adjusting the pressure loss of the model, the pressure loss ΔP1 with respect to the unit thickness of the resistance adjusting member 11 on the upstream side is adjusted. The pressure loss ΔP2 with respect to the unit thickness of the resistance adjusting member 12 on the downstream side is made smaller than the pressure loss ΔPt with respect to the target unit thickness calculated from the thickness tt required for the mold 1Y and the required pressure loss. The pressure loss setting method of the model is considered in which the pressure loss ΔPt with respect to the unit thickness is larger and the thickness t1 of the upstream resistance adjusting member 11 is larger than the thickness t2 of the downstream resistance adjusting member 12.

  However, the pressure loss setting method of this model also has the following problems. In other words, the resistance adjusting members 11 and 12 arranged on the upstream side and the downstream side are configured by one or a plurality of overlapping layers, but the overlapping of a plurality of materials having the same resistance characteristic or materials having different resistance characteristics are used. Even if the resistance adjusting members 11 and 12 are configured by overlapping, the pressure loss characteristics of the model 1Y as shown in FIG. 12 are not necessarily obtained, and the pressure of the model 1A manufactured as shown in FIG. In some cases, the loss (solid line: model) Pm does not become the target pressure loss (dotted line: target) Pt, but a difference ΔPt1 occurs with the target pressure loss Pt. In such a case, it seems that the problem can be solved by newly manufacturing the resistance adjusting members 11 and 12 having the desired pressure loss Pt or the material forming the same. It is not realistic considering the shortening.

  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) provides model pressure loss setting method, model pressure loss adjustment structure, and fluid test model that can be matched to the target pressure loss characteristics There is to do.

  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 required 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 thickness of the gap. In the method for adjusting the pressure loss of the model having the first step of adjusting the pressure loss of the model, the pressure loss of the structure for adjusting the pressure loss of the model adjusted in the first step deviates from the target pressure loss. One of the resistance adjustment member or the resistance adjustment member on the downstream side is used as a resistance adjustment member for readjustment, and the resistance adjustment member for readjustment is provided with a sub-gap portion between two new sub-resistance adjustment members. By adjusting the pressure characteristics and thickness of both sub resistance adjusting members, adjustment is made so as to generate the pressure loss required for the resistance adjusting member for readjustment, and The method is characterized by comprising a second step of adjusting the thickness required for the readjustment resistance adjusting member by adjusting the thickness.

  That is, one of the resistance adjusting members provided at the front (upstream side) or the rear (downstream side) is formed by two sub resistance adjusting members and a sub gap, and the resistance adjusting member and the sub resistance adjusting member constituting the resistance adjusting member. A self-similar (fractal) setting method is adopted in which the relationship between the sub-gap and the sub-gap is the same as the relationship between the model pressure loss adjustment structure, the resistance adjusting member constituting the model, and the gap.

  According to this method, since the resistance characteristic of the resistance adjusting member that has been obtained only by superimposing the materials of the resistance adjusting member so far can be obtained by applying again the combination of the sub resistance adjusting member and the sub gap portion, The deviation from the target pressure loss characteristic can be easily compensated. Therefore, compared to the model pressure loss adjustment method considered above, it is possible to set a combination of resistance adjustment members that matches the target pressure loss characteristics.

  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 adjustment structure of the model configured as described above, one of the upstream side resistance adjustment member or the downstream side resistance adjustment member is used as a resistance adjustment member for readjustment, and this resistance adjustment member for readjustment is newly added. The two sub-resistance adjusting members are arranged on the upstream side and the downstream side of the fluid flow, respectively, and a sub-gap portion is provided between both the sub-resistance adjusting members. For adjustment of characteristics and thickness And adjusting the thickness to be required for the readjustment resistance adjustment member by adjusting the thickness of the sub-gap part. Configured.

  According to this configuration, the resistance characteristic of the resistance adjusting member that has been obtained only by superimposing the material of the resistance adjusting member so far can be obtained by reapplying the combination of the sub resistance adjusting member and the sub gap portion. The deviation from the target pressure loss characteristic can be easily compensated. Therefore, compared with the model pressure loss adjustment method previously considered, it is possible to set a combination of resistance adjustment members that matches the target pressure loss characteristics.

  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, the model pressure loss adjustment structure, and the fluid test model used in the fluid test such as the wind tunnel test of the automobile according to the present invention, the material of the resistance adjustment member has been used so far. The resistance characteristic of the resistance adjustment member that was obtained only by superimposition can be obtained by re-applying the combination of the sub resistance adjustment member and the sub air gap part, so it is easy to deviate from the target pressure loss characteristics so far Can make up for. Therefore, it becomes possible to set a combination of resistance adjusting members that matches the target pressure loss characteristics.

  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 a typical assembly figure showing composition of a structure for pressure loss adjustment of a model in the 1st step for explaining a pressure loss setting method of a model of an 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 typical assembly figure showing composition of a model pressure regulation structure in the 2nd step for explaining a pressure loss setting method of a model of an embodiment concerning the present invention. It is a figure which shows the structure of the pressure loss adjustment structure of the model of embodiment which concerns on this invention, and an internal pressure loss. It is a figure which shows the relationship between the wind speed and pressure loss by the structure for pressure loss adjustment of a model. 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 assembly figure showing the composition of the structure for pressure loss adjustment of the model of improved technology. It is the typical sectional side view which showed the structure of the structure for pressure loss adjustment of the model of an improved technique. It is a figure which shows the structure of the structure for pressure loss adjustment of the model of an improved technique, and an internal pressure loss.

  Hereinafter, a model pressure loss setting method, a model pressure loss adjusting structure, and a fluid test model according to embodiments 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 model 10A for pressure loss adjustment of the model manufactured first shown in FIGS. 1 to 3 will be described. As shown in FIGS. 1 to 3, the pressure loss adjusting structure 10 </ b> A of this model is for adjusting the pressure loss of the air F flowing inside the model 1 </ b> A used in the wind tunnel test using air (fluid) F. In the housing 2 of the model 1A, resistance adjusting members (ventilating resistors) 11 and 12 that generate a pressure loss as a resistance against 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 10A for pressure loss adjustment of the model shown in FIGS. 1 to 3 will be described.

  In this model pressure loss setting method, in the first step, the resistance adjusting members 11 and 12 are disposed on the upstream side and the downstream side of the flow of the air F, respectively, and a gap is provided between both the resistance adjusting members 11 and 12. 3 is provided, and the amount of pressure loss required for the model 1A is set based on the pressure characteristics and thicknesses t1 and t2 of both resistance adjustment members 11 and 12, and the resistance adjustment members 11 and 12 The thickness Bs of the gap 3 is set so that the sum of the thicknesses t1 and t2 and the thickness Bs of the gap 3 becomes the thickness tt necessary for the model pressure loss adjusting structure 10A. Further, the pressure loss ΔP1a 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 for the model 1A 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 10A is distributed and supported by the resistance adjusting members 11 and 12 arranged on the front and rear surfaces of the model pressure loss adjusting structure 10A. The thickness tt is adjusted by the thickness Bs of the gap 3.

  More specifically, in the first step, as shown in FIG. 3, the material of the upstream resistance adjusting member 11 has a pressure gradient ΔP1a (pressure gradient shown by “model” in FIG. 3) with respect to the unit thickness. , Pressure gradient with respect to unit thickness (desired pressure loss (Pt) / thickness of model pressure loss adjusting structure (tt)) required for model pressure loss adjusting structure 10A ΔPt (“ The pressure gradient is preferably selected to be smaller than the target pressure gradient).

  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 1A” in FIG. 3) with respect to the unit thickness. From the pressure gradient (desired pressure loss (Pt) / model pressure loss adjusting structure thickness (tt)) ΔPt (pressure gradient indicated by “target” in FIG. 3) required for the body 10A Choose a big and steep one.

  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 ΔP1a with respect to the unit thickness of the material of the resistance adjusting member 11. To calculate the pressure loss P1a due to the resistance adjusting member 11. This pressure loss P1a is subtracted from the desired pressure loss Pt to calculate the pressure loss P2 to be generated in the resistance adjusting member 12 on the downstream side.

  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 thickness Bs is calculated. That is, Bs = 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 thickness 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 member 11, 12 and the thickness Bs of the gap 3. Thus, the model pressure loss adjusting structure 10A is configured.

  If the pressure loss Pm of the model pressure loss adjusting structure 10A obtained by this method becomes the desired pressure loss Pt, then the model pressure loss adjusting structure 10A is the target. In practice, however, even if the resistance adjusting members 11 and 12 are configured by superimposing a plurality of materials having the same resistance characteristic or by superimposing materials having different resistance characteristics, the target pressure as shown in FIG. The loss characteristic is not always obtained, and the pressure loss (solid line: model) Pm of the model 1A manufactured as shown in FIG. 3 does not become the target pressure loss (dotted line: target) Pt, but the target pressure loss Pt There may be a difference ΔPt1 between the two.

  The present invention is applied to such a case. In this case, as shown in FIG. 4, the upstream side resistance adjusting member 11 (or the downstream side resistance adjusting member 12) is used as the second step. Is a resistance adjustment member 11 for readjustment, and this resistance adjustment member 11 for readjustment is formed by arranging a new two sub resistance adjustment members 11a and 11b with a sub gap portion 4 therebetween. By adjusting the pressure characteristics and the thicknesses t11 and t12 of both of the auxiliary resistance adjusting members 11a and 11b, adjustment is made so as to generate the pressure loss Pt required for the resistance adjusting member 11 for readjustment, and the auxiliary gap 4 By adjusting the thickness Bs1, the thickness t1 required for the resistance adjustment member 11 for readjustment is adjusted.

  That is, one of the resistance adjusting members 11 and 12 provided in the front part or the rear part is formed by the two sub resistance adjusting members 11a and 11b and the sub gap part 4, and the resistance adjusting member 11 and the sub resistance adjusting member constituting the resistance adjusting member 11 are formed. The relationship between the members 11a and 11b and the sub-gap portion 4 is the same as the relationship between the model pressure loss adjusting structure 1A, the resistance adjusting members 11 and 12 constituting this, and the gap portion 3, and is self-similar (fractal). Use the setting method.

  More specifically, in the second step, as shown in FIG. 5, pressure gradients ΔP11 and ΔP12 (see FIG. 5) for the sub resistance adjusting members 11a and 11b to be replaced with the upstream resistance adjusting member 11 are used. 5 is the pressure gradient with respect to the unit thickness (desired pressure loss (Pt-P2) / resistance adjusting member thickness (t1)) required by the upstream resistance adjusting member 11. ) Select a larger one than ΔP1t.

  Then, the thickness t11 of the auxiliary resistance adjusting member 11a is set to such a thickness that the deflection amount is within an allowable range with respect to the wind pressure (fluid pressure), and the pressure loss ΔP11 with respect to the unit thickness of the material of the auxiliary resistance adjusting member 11a. By multiplying the thickness t11, the pressure loss P11 due to the sub resistance adjusting member 11a is calculated. This pressure loss P11 is subtracted from the pressure loss P1b required for the resistance adjusting member 11 to calculate the pressure loss P12 that should be generated in the sub resistance adjusting member 11b on the downstream side.

  The pressure loss P12 is divided by the pressure loss ΔP12 with respect to the unit thickness of the material of the downstream side secondary resistance adjusting member 11b to calculate the thickness t12 of the downstream side secondary resistance adjusting member 11b. With this thickness t12, it is confirmed that the amount of bending of the auxiliary resistance adjusting member 11b is within an allowable range with respect to the wind pressure (fluid pressure). If the amount of bending of the sub resistance adjusting member 11b does not fall within the allowable range, the material of the sub resistance adjusting member 11b on the downstream side is selected again.

  Then, after the amount of deflection of the auxiliary resistance adjusting member 11b falls within the allowable range, the total of the thickness t11 of the auxiliary resistance adjusting member 11a and the thickness t12 of the auxiliary resistance adjusting member 11b is calculated from the thickness t1 required for the resistance adjusting member 11. Is subtracted to calculate the thickness Bs1 of the sub gap 4. That is, Bs1 = t1− (t11 + t12).

  When the sum of the thickness t11 of the auxiliary resistance adjusting member 11a and the thickness t12 of the auxiliary resistance adjusting member 11b is larger than the thickness t1 of the resistance adjusting member 11, the material of the auxiliary resistance adjusting members 11a and 11b is selected again and again. The thicknesses t11 and t12 and the thickness Bs1 of the sub-gap part 4 are recalculated.

  As shown in FIG. 4, the auxiliary resistance adjusting members 11a and 11b have thicknesses t11 and t12 and the thickness Bs1 of the auxiliary gap 4, and the upstream auxiliary resistance adjusting member 11a and the downstream auxiliary resistance adjusting member are provided. 11b and the resistance adjusting member 12 on the downstream side are arranged to constitute a model pressure loss adjusting structure 10B.

  Accordingly, a model pressure loss adjusting structure 10B having a pressure loss as shown in FIG. 5 (solid line indicated by “model 1B”) can be manufactured. Note that the dotted line indicated by “target” in FIG. 5 indicates the pressure gradient ΔPt at the desired pressure loss Pt.

  According to this method, the resistance characteristics of the resistance adjusting members 11 and 12 that have been obtained only by superimposing the materials of the resistance adjusting members 11 and 12 until now are obtained by combining the sub resistance adjusting members 11a and 11b and the sub gap portion 4. Since it can be obtained by applying again, the deviation ΔPt1 from the target pressure loss ΔPt so far can be easily compensated. Accordingly, the model pressure loss adjusting structure 10B that matches the target pressure loss ΔPt can be manufactured as compared with the pressure loss adjusting structure 10A of the first step model.

  As a result, 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. In particular, since the thickness tt of the pressure loss adjusting structure 10B of the model is adjusted by the thicknesses Bs and Bs1 of the gap 3 and the sub-gap 4, the total thickness of the resistance adjustment member 12 and the sub-resistance adjustment members 11a and 11b. It is no longer necessary to select the resistance adjusting member 12 and the auxiliary resistance adjusting members 11a and 11b so that the thickness of the model becomes tt, and the thicknesses and combinations of the various resistance adjusting members 12 and the auxiliary resistance adjusting members 11a and 11b are preliminarily determined. This makes it possible to use the measured pressure characteristics, and saves the trouble of measuring the resistance when creating a model.

  In addition, since the model pressure loss adjusting structure (resistor model) 10B satisfying the thickness requirement necessary for the model 1B can be set, the model in which 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 10B can be created, and the accuracy of the result in the analytical calculation at the time of comparative verification can be improved.

  According to the pressure loss setting method of the above model, one of the upstream side resistance adjusting member 11 or the downstream side resistance adjusting member 12 is used as a resistance adjusting member 11 for readjustment, and this resistance adjusting member 11 for readjustment is Two new sub resistance adjusting members 11a and 11b are arranged on the upstream side and the downstream side of the flow of the fluid F, respectively, and the sub gap part 4 is provided between both the sub resistance adjusting members 11a and 11b. By adjusting the pressure characteristics ΔP11, ΔP12 and the thicknesses t11, t12 of both the auxiliary resistance adjusting members 11a, 11b, adjustment is made so as to generate the pressure loss ΔP1t required for the resistance adjusting member 11 for readjustment. By adjusting the thickness Bs1 of the gap 4, the model pressure loss adjusting structure adjusting structure 10B adjusted to the thickness t1 required for the readjustment resistance adjusting member 11 can be obtained.

  Further, by producing the fluid test model 1B including the pressure loss adjusting structure 10B of the model, the model has a pressure loss characteristic with respect to the flow velocity of the model that matches the desired pressure loss characteristic, and is compared and verified. It is possible to improve the accuracy of the result in the analysis calculation.

  The model pressure loss setting method of the present invention, the model pressure loss adjusting structure, and the model for fluid test have the resistance characteristics of the resistance adjusting member obtained only by superimposing the resistance adjusting members so far, sub resistance Since the combination of the adjustment member and the sub-gap part can be obtained again, it is possible to easily compensate for the deviation from the target pressure loss characteristic so far. Therefore, the degree of freedom in selecting a material for the resistance adjusting member is further increased, and a model pressure loss adjusting structure (resistor model) having a resistance characteristic closer to 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.

1A, 1B, 1X, 1Y Model 2 Housing 3 Gap 4 Sub-gap 10A, 10B, 10X, 10Y Model pressure loss adjustment structure 11, 12 Resistance adjustment member 11a, 11b Sub-resistance adjustment member 14 Support member Bs Gap Part thickness Bs1 Sub-gap thickness F Air (fluid)
P1a Pressure loss due to the upstream resistance adjustment member P1b Pressure loss due to the secondary resistance adjustment member P2 Pressure loss due to the downstream resistance adjustment member Pm Pressure loss of the model obtained in the first step Pt Desired pressure loss required for the model ΔP1a Pressure loss per unit thickness of upstream resistance adjusting member (pressure gradient)
ΔP11 Pressure loss per unit thickness (pressure gradient) of the auxiliary resistance adjusting member on the upstream side
ΔP12 Pressure loss per unit thickness of the secondary resistance adjusting member on the downstream side (pressure gradient)
ΔP2 Pressure loss per unit thickness of the resistance adjustment member on the downstream side (pressure gradient)
ΔP1t Pressure loss per unit thickness (pressure gradient) required for upstream resistance adjusting member ΔPt Pressure loss per unit thickness (pressure gradient) calculated from pressure loss and thickness required for model
ΔPt1 Difference between the pressure loss of the model obtained in the first step and the desired pressure loss t1, t2 Thickness of the resistance adjusting member t11, t12 Thickness of the auxiliary resistance adjusting member tt Desired required for the pressure loss adjusting structure of the model Thickness

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 method for adjusting the pressure loss of the model, the first step of adjusting the thickness required for the model by adjusting the thickness of the gap is adjusted so as to generate the pressure loss required for the model.
When the pressure loss of the pressure loss adjustment structure of the model adjusted in the first step deviates from the target pressure loss, either the upstream side resistance adjustment member or the downstream side resistance adjustment member is readjusted. The resistance adjustment member for readjustment is formed by arranging two new sub-resistance adjustment members with a sub-gap between them, and the pressure characteristics and thickness of both sub-resistance adjustment members By adjusting the thickness of the sub-gap, the adjustment is made so that the pressure loss required for the readjustment resistance adjustment member is generated. A pressure loss setting method for a model, comprising a second step of adjusting.   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,
One of the upstream side resistance adjusting member or the downstream side resistance adjusting member is used as a resistance adjusting member for readjustment, and the resistance adjusting member for readjustment is replaced with two new sub resistance adjusting members upstream of the fluid flow. And adjusting the pressure characteristics and thickness of both of the sub-resistance adjusting members to adjust the resistance for readjustment. The pressure of the model is adjusted so as to generate a pressure loss required for the adjusting member, and adjusted to the thickness required for the resistance adjusting member for readjustment by adjusting the thickness of the sub-gap. Loss adjustment structure.   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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