CN110672302A - Low-disturbance large-flow high-speed circulating water tunnel experiment system - Google Patents
Low-disturbance large-flow high-speed circulating water tunnel experiment system Download PDFInfo
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Abstract
The invention relates to a low-disturbance large-flow high-speed circulating water tunnel experiment system, which comprises a water tunnel experiment section, a rear backflow square pipe section, a water pump system section, a front backflow square pipe section and a pressure stabilizing and flow regulating system, wherein the water tunnel experiment section, the rear backflow square pipe section, the water pump system section and the front backflow square pipe section are horizontally arranged and are sequentially connected end to form a main loop; the cross sections of the pipelines of the water tunnel experiment section and the water pump system section are circular, and the sectional area is S1; the pipeline sections of the rear return square pipe section and the front return square pipe section are rectangular, and the sectional area is S2; the area ratio of the two is more than or equal to 1.0 and less than or equal to 1.3 of S2/S1; the four parts of the main loop are respectively in transition connection by round-to-square pipe sections; the water tunnel experiment section comprises a preposed steady flow section, an experiment window section and a postposition steady flow section which are sequentially arranged along the main flow direction; the length of the front steady flow section is greater than that of the rear steady flow section; the water pump is arranged in the water pump system section, and the output end of the pressure stabilizing and flow adjusting system is connected to the front main loop and the rear main loop of the water pump through two T-shaped tee joints.
Description
Technical Field
The invention belongs to the research field of hydrodynamics and experimental hydrodynamics, and particularly relates to a low-disturbance large-flow high-speed circulating water tunnel experiment system.
Background
In the research of hydrodynamics and hydrodynamics, a water tunnel with a good flow field condition is an indispensable experimental platform and equipment for researching underwater high-speed moving bodies. Especially, nowadays, the attention on underwater high-speed motion is higher and higher, and in order to restore real flow as much as possible, it is very important to establish a test system with low disturbance, high flow rate, large flow and low cavitation rate.
Currently, the world has only three approved high-speed water holes: 1) the water speed of the ultra-high-speed water tunnel at the State university of Binxiania is 83.8m/s, and the diameter of the cross section is 0.038 m; 2) the water speed of a high-speed water tunnel of a Swiss hydro-mechanical laboratory is 50m/s, the section size of a test section is 0.15m multiplied by 0.15m, and the length is 0.75 m; 3) the water velocity of the high-speed water tunnel of the Netherlands maritime research institute is 65m/s, and the section size of the test section is 0.05m multiplied by 0.05m and the length is 4 m. However, the sizes of the test sections of the existing high-speed water tunnel are small, and the sectional area of the test sections is less than 0.04m2. Up to now, the largest dimension of the test section is KPyn0B-3 water hole cross-section size of Russian St.Petersburg of 1.3m by 1.3m, and the water velocity is only 15 m/s.
The existing test water tunnel system mostly adopts the design of a circulating water tunnel, and the circulating water tunnel system is connected through a stable section, a contraction section, a test section and other structures and forms a circulation through a return pipeline. However, in a high-flow high-speed circulating water tunnel, the loss of flow due to the existence of the contraction section and the expansion section is enormous. Meanwhile, the cavitation phenomenon caused by the increase of the disturbance can also greatly reduce the stability of a flow field in the water tunnel, and the performance of related equipment such as a water pump is reduced, so that the accuracy of a water tunnel related test is influenced.
In summary, the cross-sectional area is set to be larger than 0.04m2The low disturbance, large flow, high water velocity, large size water tunnel is still a worldwide problem, wherein the key problem is how to establish a low disturbance, high velocity, large flow circulation water tunnel and the cavitation problem of controlling and weakening the water flow.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a low-disturbance large-flow high-speed circulating water tunnel experiment system which is simple in structure, reasonable in design, large in cross section area of an experiment section, high in flow speed and flow rate and small in on-way disturbance.
The invention is realized by the following technical scheme:
a low-disturbance large-flow high-speed circulating water tunnel experiment system comprises a water tunnel experiment section, a rear backflow square pipe section, a water pump system section, a front backflow square pipe section and a pressure stabilizing and flow regulating system, wherein the water tunnel experiment section, the rear backflow square pipe section, the water pump system section and the front backflow square pipe section are horizontally arranged and are sequentially connected end to form a main loop;
the cross sections of the pipelines of the water tunnel experiment section and the water pump system section are circular, and the sectional area is S1; the pipeline sections of the rear return square pipe section and the front return square pipe section are rectangular, and the sectional area is S2; the area ratio of the two is more than or equal to 1.0 and less than or equal to 1.3 of S2/S1; the four parts of the main loop are respectively in transition connection by round-to-square pipe sections;
the water tunnel experiment section comprises a preposed steady flow section, an experiment window section and a postposition steady flow section which are sequentially arranged along the main flow direction; the length of the front steady flow section is greater than that of the rear steady flow section;
the water pump is arranged in the water pump system section, and the output end of the pressure stabilizing and flow adjusting system is connected to the front main loop and the rear main loop of the water pump through two T-shaped tee joints.
Preferably, the downstream pipe sections of the water pumps in the preposed voltage stabilizing section and the water tunnel experiment section are respectively provided with a circular pipe rectifier along the cross section; the circular tube rectifier comprises an inner circle, an outer circle and spoke-shaped circular tube rectifying blade cascades; radius of outer circle RsThe diameter of the inner circle is the same as that of the corresponding pipe section, and the radius r of the inner circle iss＝0.1Rs～0.3RsThe circular tube rectifying blade cascade is a thin sheet with the same flow direction as the main flow.
Preferably, the rear return square pipe section and the front return square pipe section are circular arc square pipe sections, and the circular arc radius R of the square pipe sectionscSatisfies the following conditions: 4R0≤Rc≤8R0Wherein R is0And the inner diameter of the round pipeline of the water tunnel experiment section is shown.
Furthermore, a square tube rectifier is arranged inside each of the rear-mounted return square tube section and the front-mounted return square tube section, each square tube rectifier comprises a rectangular outer frame and a square tube rectifying blade cascade in the vertical direction, the cross section of each square tube rectifying blade cascade is arc-shaped, and the curvature k is 1/Rc。
Furthermore, on the arc inner side wall surfaces of the rear return square pipe section and the front return square pipe section, the distance from the outlet section of the return square pipe section to the outlet section is 0.1Rc～0.4RcAn exhaust pipeline and an exhaust valve are arranged at the position;
the part of the exhaust pipeline in the main loop flow channel is a pipeline with a plurality of holes on the side wall and an opening end, one end extending out of the pipeline is connected with an exhaust valve, and the installation height of the exhaust valve is higher than the upper end plane in the main loop.
Preferably, the water pump is an axial flow pump, and the inner diameter R of the volute of the axial flow pump isbWith the internal diameter R of the pipeline of the water pump system section0The relationship of (1) is:
Rb＝k1·R0wherein k is1Is a proportionality coefficient, k is more than or equal to 0.91≤1.2；
The main shaft of the axial-flow pump is driven by a connecting rod, and the connecting rod penetrates through the pipe wall of the rear-mounted backflow square pipe section and is connected with a variable-frequency motor.
Preferably, the pressure stabilizing and flow regulating system comprises two high-pressure tanks, and the lower end points of the high-pressure tanks are lower than the bottom plane of the main loop pipeline; the bottom of the high-pressure tank body is connected with a throttle valve, the output ends of the two throttle valves are respectively connected with a first end of a tee joint, second ends of the two tee joints are mutually communicated through a flow regulating valve, and third ends of the two tee joints are respectively connected to a main loop in front of and behind the water pump as the output ends of a pressure stabilizing and flow regulating system.
Further, the volume of the high-pressure tank body is VTHere having VT＝0.5·k·V·ΔU/UpK is an adjusting coefficient of 0.7-1.4, V is the volume of water contained in the main loop, delta U is the variable flow rate range required by the system, and U is the variable flow rate range required by the systempTo design the flow rate.
Further, a gas-liquid mixed cavity is arranged inside the high-pressure tank body, water-insoluble gas is arranged on an interface, and water is arranged below the interface; volume V of water in the pressure vessel at steady statew＝0.5·k·VTAnd k is an adjusting coefficient.
Still further, the pipe diameter of the connecting pipeline in the pressure stabilizing and flow regulating system is r0And has r0＝0.7·k·R0·ΔU/UpWherein R is0The radius of the pipeline of the experimental pipe section, k is an adjusting coefficient, delta U is a variable flow rate range required by the system, and U ispTo design the flow rate.
The invention has the following beneficial technical effects:
according to the high-speed circulation water tunnel experiment system, the pipeline sectional area of the main loop changes little along the way, so that a contraction acceleration section in front of a test section and an expansion section behind the test section of the traditional water tunnel are avoided, the local resistance loss caused by sudden change of the sectional area is reduced, the disturbance is low, and the energy loss is small; the pipeline with the square cross section is adopted in the backflow square pipe section, compared with the traditional round pipeline, the disturbance in the pipeline is effectively reduced, the reverse vortex pair which often appears in a round bent pipe is avoided to a certain extent, and the loss of the bent pipe in the flowing process is reduced; in a traditional circular pipeline, a double-vortex-shaped secondary flow is formed on the cross section of the traditional circular pipeline at a bend due to the imbalance of centrifugal force of fluid particles in the bend and is superposed on a main flow along an axis, and the motion track of the fluid particles is in a spiral shape, namely a reverse vortex pair is generated. The 'reverse vortex pair' lengthens the motion track of fluid particles, and simultaneously aggravates the disturbance in the pipe, so that the flow loss is increased, the centrifugal force distribution of the fluid particles in the pipe with the square cross section is more balanced, and the secondary flow of double vortices can not be generated, so that the flow loss at the bend is reduced.
Furthermore, the high-speed circulating water tunnel experiment system adopts a motor frequency conversion method to meet energy input under variable working conditions of the system, and adopts a bypass adjusting method to ensure the stability of the flow adjusting process, so that the method avoids arranging a throttle valve on the main loop, avoids disturbance and energy loss caused by sudden change of the sectional area on the main loop, and reduces the influence of the flow adjusting process on the main loop as much as possible. When the traditional water tunnel system is in a variable working condition, a main loop is often adopted to set a throttle valve to be in a variable working condition, and the flow resistance of the throttle valve is increased or reduced, so that the flow speed of fluid in the water tunnel during balance is reduced or improved when the water pump works for a certain time. The method has the biggest defect that the problem that the power input is not matched with the power consumption of the water tunnel under the variable working condition is not solved from an energy input source, the relation between the power input and the power consumption of the water tunnel is balanced only by changing the flow resistance of the throttle valve and changing the power consumption of the water tunnel, and disturbance is increased to cause extra energy loss. The input power of the water pump is changed through the variable frequency pump, the matching problem of the input power and the power consumption of the water hole is solved from the source, the brought disturbance is less, and the energy loss is small.
Further, the high-speed circulating water tunnel experiment system adopts the axial flow pump as the water pump, and utilizes the characteristics of the axial flow pump: the flow is big, the pressure head is low, the tail disturbance is few for the energy head loss that is used for the stationary flow to bring behind the water pump export is little. And the matching requirement of power input during the variable working condition of the system is met by matching with a variable frequency motor, the continuous change of frequency conversion is utilized to ensure that the water pump works in a high-performance interval, the energy loss of the system is reduced, and the high efficiency of the system is ensured.
Furthermore, two gas-liquid mixing tanks are respectively matched in the front and the back of the water pump, and the flow in the main loop is stabilized by utilizing the compressibility of gas, so that the pressure fluctuation caused by the change of the flow in the main loop is reduced, and the vibration of the system during the change of the flow is reduced. The large-flow high-speed water tunnel mostly adopts a closed pipeline design, when the traditional water tunnel system is in a variable working condition, under the action of the inertia force of liquid in a pipeline, the traditional water tunnel system can bring large vibration to the whole water tunnel system, and in addition, the compressibility of water is poor, huge pressure fluctuation can be brought under the action of the inertia force, and meanwhile, the working condition of the water pump can be deteriorated; this test system, through setting up two surge tanks, utilize the better characteristics of air compressibility, as buffer gear, absorb or release the pressure energy that compressed air stored when becoming the operating mode for whole variable operating mode process is more steady, and the operating condition of water pump also obtains improving.
Drawings
Fig. 1 is a schematic structural diagram of a large-flow high-speed water tunnel system capable of being regulated and controlled at will in the embodiment of the invention.
Fig. 2 is a shape of a circular tube rectifier according to an example of the present invention.
Fig. 3 shows the shape of the square tube rectifier according to the example of the present invention.
Wherein: 1a, 1b, 1c and 1 d-round-to-square pipe sections, 2a and 2 b-round pipe rectifiers, 3-water hole experimental sections, 4-experimental window sections, 5a, 5b and 5 c-square pipe rectifiers, 6 a-rear backflow square pipe sections, 6 b-front backflow bent pipe sections, 7-variable frequency motors, 8-voltage stabilizing and flow regulating systems, 9a and 9 b-exhaust valves, 10-water pumps and 11-water pump system sections.
Detailed Description
The present invention is further described in detail below with reference to specific examples:
the experimental system is horizontally arranged, the flow speed in the main loop is changed by changing the opening degree of the regulating valve in the flow regulating system on the parallel loop, and the pressure fluctuation brought by the change of the flow speed is stabilized by the pressure stabilizing tank. Rectifiers are arranged in the water tunnel experiment section 3, the rear backflow square pipe section 6a, the water pump system section 11 and the front backflow square pipe section 6b, and disturbance is reduced. The invention has the advantages of reasonable design, safe and reliable structure, less disturbance, small loss along the course and local resistance, large flow, stable flow regulation process and stable pressure fluctuation, ensures the stability of the flow field of the experimental section by adopting hydrodynamic design, is suitable for the research of hydrodynamic related problems with large size, high speed and large flow, provides a good experimental platform for the development of hydrodynamic related experimental research, and is particularly suitable for the development of large size and high speed underwater flow characteristic research.
Specifically, as shown in fig. 1, the invention provides a low-disturbance large-flow high-speed circulating water tunnel experiment system, which comprises a water tunnel experiment section 3, a rear backflow square pipe section 6a, a water pump system section 11, a pressure stabilizing and flow regulating system 8, a front backflow square pipe section 6b and circular-to-square sections 1a, 1b, 1c and 1 d; the experiment system is horizontally arranged, and a main loop is formed by sequentially connecting a water tunnel experiment section 3, a rear backflow square pipe section 6a, a water pump system section 11 and a front backflow square pipe section 6b end to end and using a round-to-square section as transition connection; the pressure stabilizing and flow regulating system 8 is connected with the main loop in parallel through two T-shaped tee joints in front of and behind the water pump.
The cross sections of the pipelines of the water tunnel experiment section 3 and the water pump system section 11 are circular, and the cross section is S1; the pipeline sections of the rear return square pipe section 6a and the front return square pipe section 6b are rectangular, and the sectional area is S2; the area ratio of the two is more than or equal to 1.0 and less than or equal to 1.3 of S2/S1; rectangular pipes can preferably be square, and the pipes with two different cross sections are connected through the round changed square sections 1a, 1b, 1c and 1 d.
The pipeline of the water tunnel experiment section 3 is a round pipeline, the experiment section is integrally divided into a front steady flow section, an experiment window section 4 and a rear steady flow section, and the length of the front steady flow section is larger than that of the rear steady flow section due to the requirement of the experiment section on steady flow.
Referring to fig. 2, a circular tube rectifier 2a is disposed in the front current stabilizing section, and the circular tube rectifier is composed of an inner circle, an outer circle and a fox-shaped straight-type rectifying cascade, wherein the outer circle has a radius RsPipe diameter R of water tunnel experimental section 30Same, inner circle radius rs＝0.1Rs～0.3RsThe flow-regulating blade cascade is a thin sheet with the same flow direction as the main flow, the thin sheet is linear, and the section can be a plate shape or an optimized variable-thickness blade;
and the rear part of the water tunnel experimental section 3 is connected with a rear backflow square pipe section 5a through a round square section 1 b. The rear-mounted reflux square pipe section is a circular arc pipe section with the radius R of the circular arccSatisfies the following conditions: 4R0≤Rc≤8R0Wherein R is0The inner diameter of the round pipeline of the experimental section 3 of the water tunnel is shown.
A square tube rectifier and an exhaust pipeline are arranged in the rear backflow square tube section 5a and the front backflow square tube section 6 b; as shown in fig. 3, the square tube rectifier is composed of a rectangular outer frame and a vertically-arranged rectifying blade cascade, the cross section of the blade cascade is arc-shaped, and the curvature k is 1/RcWherein R iscThe radius of the corresponding rear backflow square pipe section or the radius of the front backflow square pipe section 6 b; the exhaust pipeline is arranged on the inner side wall surfaces of circular arcs of the rear backflow square pipe section 6a and the front backflow square pipe section 6b, the part in the flow channel of the elbow is a porous pipeline with an opening end, the exhaust pipeline extends out of the elbow and then is connected with an exhaust valve, and the installation height of the exhaust valve is higher than the upper end plane in the main loop; exhaust pipeThe mounting position of the channel is 0.1-0.4R away from the outlet section of the backflow square pipe sectioncWhere R iscIs the radius of the return square tube section.
The rear backflow square pipe section is connected with the water pump system section 11 through the round-to-square section. A water pump 10 and a circular tube rectifier 2b are arranged in the water pump system section 11, an axial flow pump is preferably adopted for the water pump 10, a main shaft of the axial flow pump is driven by a connecting rod, and the connecting rod penetrates through the outer wall surface of the rear backflow square pipe section to be connected with a variable frequency motor;
volute inner diameter R of axial flow pumpbInner diameter R of pipeline with water pump system section 110The relationship of (1) is: rb＝k·R0Wherein k is a proportionality coefficient, k is more than or equal to 0.9 and less than or equal to 1.2;
the water pump system section 11 passes through the round-to-square section 1d and is connected with the front backflow square pipe section 6b in the rear. Two square tube rectifiers 5b and 5c are arranged in the front backflow square tube section 6b, an exhaust pipeline and an exhaust valve 9b are arranged on the inner tube wall, and the installation position of the exhaust valve is the same as that of the exhaust valve on the rear backflow bent pipeline.
The pressure stabilizing and flow regulating system 8 is connected to the main loop through two T-shaped tee pipe joints in front of and behind the water pump. The pressure and flow regulation system 8 comprises a flow regulation loop and two pressure-regulated high-pressure tanks 81. The lower end point of the high-pressure tank 81 is lower than the bottom plane of the main loop pipeline, a throttle valve 82 is arranged at the bottom of the tank, the output ends of the two throttle valves 82 are respectively connected with the first end of a tee joint, the second ends of the two tee joints are mutually communicated through a flow regulating valve 83, and the third ends of the two tee joints are respectively connected with the main loop in front of and behind the water pump 10 as the output ends of a pressure stabilizing and flow regulating system 8.
The inner part of the pressure stabilizing and flow regulating system 8 has a pipe diameter r0Is connected with a circular pipe and has r0＝0.7·k·R0·ΔU/UpWherein R is0The radius of the pipeline in the experimental section of the water tunnel is determined, k is an adjusting coefficient, k is 0.7-1.4, delta U is a variable flow rate range required by the system, and U is a variable flow rate range required by the systempTo design the flow rate. And in the scheme, the allowable maximum variable flow rate range delta Umax＝0.6·Up。
Of tanksThe interior is a cavity for mixing gas and liquid, the gas which is not dissolved in water, such as nitrogen or inert gas with a certain proportion, is above the gas-liquid interface, and the liquid is below the gas-liquid interface. The volume of two high-pressure tanks 81 included in the pressure-stabilizing and flow-regulating system is VTHere having VT＝0.5·k·V·ΔU/UpK is an adjusting coefficient, k is 0.7-1.4, V is the volume of water contained in the main loop, delta U is the variable flow rate range required by the system, and U is the variable flow rate range required by the systempFor designing the flow rate, and in this case, the maximum allowable variable flow rate range DeltaUmax＝0.6·Up。
Based on the experimental system, in the experimental process, the specific implementation method comprises the following steps:
1. in the starting stage of the water tunnel, because the water volume in the high-speed water tunnel is large, the load is large in the process of slow starting, but the water pump is dragged by the motor, and the starting characteristic of the motor requires that the load in the initial stage cannot be overlarge, so that the flow regulating valve 83 in the pressure stabilizing and flow regulating system 8 is kept fully open in the starting stage, the throttle valve 82 connected with the two high-pressure tanks is half-opened, and the starting process of the variable frequency motor is controlled by the frequency converter; after the motor works stably, the water tunnel enters an acceleration stage, and the flow regulating valve 83 in the pressure stabilizing and flow regulating system 8 is closed gradually in 30-60 minutes, so that the flow regulating valve 83 is opened from full to 1/4 degrees, and meanwhile, the stop valve is kept half-open. At this stage, as the flow regulating valve 83 is gradually closed, the water flow speed in the water hole is gradually increased; after the water flow velocity in the water tunnel reaches the experimental requirement, the water tunnel enters a stable stage, the opening degree of a flow regulating valve 83 at the moment is maintained, a throttle valve 82 connected with two high-pressure tanks in a pressure stabilizing and flow regulating system 8 is regulated to be fully opened, and the stable flow lasts for 10 to 20 minutes;
2. after the flow is stable, the system enters a variable working condition experimental stage; when the water flow speed in the water tunnel needs to be increased, the flow regulating valve 83 is turned off, and the power of the motor is regulated through the frequency converter, so that the rotating speed of the motor is increased, and the power is increased; the combined action of the small regulating valve and the frequency converter can quickly improve the driving force in the main loop, so that the variable working condition process of the water flow is quicker; meanwhile, because the flow regulating valve 83 is suddenly reduced, the shunt of the bypass is reduced, the water flow in the main loop can be increased, but the water flow acceleration process in the main loop is slow, the increased flow can not be utilized within a short time, the throttle valve 82 connected with the high-pressure tank is in a fully-opened state, the high-pressure tank can well absorb the increased flow, the back pressure of the water pump is increased, the flow is reduced, and the vibration problem caused by pressure fluctuation when the pressure of the traditional water tunnel system is in a variable working condition is avoided. When the water flow speed in the water hole needs to be reduced, the process is just opposite to the process, but the stable pressure fluctuation can be achieved, and the problems of vibration and the like are avoided.
Claims (10)
1. A low-disturbance large-flow high-speed circulating water tunnel experiment system is characterized by comprising a water tunnel experiment section (3), a rear backflow square pipe section (6a), a water pump system section (11), a front backflow square pipe section (6b) and a pressure stabilizing and flow adjusting system (8), wherein the water tunnel experiment section, the rear backflow square pipe section, the water pump system section and the front backflow square pipe section are horizontally arranged and are sequentially connected end to form a main loop;
the cross sections of the pipelines of the water tunnel experiment section (3) and the water pump system section (11) are circular, and the cross section is S1; the pipeline sections of the rear return square pipe section (6a) and the front return square pipe section (6b) are rectangular, and the sectional area is S2; the area ratio of the two is more than or equal to 1.0 and less than or equal to 1.3 of S2/S1; the four parts of the main loop are respectively in transition connection by round-to-square pipe sections;
the water tunnel experiment section (3) comprises a preposed steady flow section, an experiment window section (4) and a postposition steady flow section which are sequentially arranged along the main flow direction; the length of the front steady flow section is greater than that of the rear steady flow section;
a water pump (10) is arranged in the water pump system section (11), and the output end of the pressure stabilizing and flow regulating system (8) is connected to the front and the rear main loops of the water pump (10) through two T-shaped tee joints.
2. The low-disturbance large-flow high-speed circulating water tunnel experiment system according to claim 1, wherein a circular tube rectifier is respectively arranged on the downstream pipe section of the water pump (10) in the preposed pressure stabilizing section (6b) and the water tunnel experiment section (3) along the cross section; round tube rectifierComprises an inner circle, an outer circle and a spoke-shaped circular tube rectifying blade cascade; radius of outer circle RsThe diameter of the inner circle is the same as that of the corresponding pipe section, and the radius r of the inner circle iss＝0.1Rs～0.3RsThe circular tube rectifying blade cascade is a thin sheet with the same flow direction as the main flow.
3. The low-disturbance high-flow high-speed circulating water tunnel experiment system according to claim 1, wherein the rear backflow square pipe section (6a) and the front backflow square pipe section (6b) are circular arc square pipe sections, and the circular arc radius R of the square pipe sectionscSatisfies the following conditions: 4R0≤Rc≤8R0Wherein R is0And the inner diameter of the round pipeline of the water tunnel experimental section (3) is shown.
4. The low-disturbance large-flow high-speed circulating water tunnel experiment system according to claim 3, wherein a square tube rectifier is arranged inside each of the rear backflow square tube section (6a) and the front backflow square tube section (6b), each square tube rectifier comprises a rectangular outer frame and a vertical square tube rectifying blade cascade, the cross section of each square tube rectifying blade cascade is arc-shaped, and the curvature k is 1/Rc。
5. The low-disturbance large-flow high-speed circulating water tunnel experimental system according to claim 3, wherein the distance from the outlet cross section of the backflow square pipe section to the inner side wall surface of the circular arcs of the rear backflow square pipe section (6a) and the front backflow square pipe section (6b) is 0.1Rc～0.4RcAn exhaust pipeline and an exhaust valve are arranged at the position;
the part of the exhaust pipeline in the main loop flow channel is a pipeline with a plurality of holes on the side wall and an opening end, one end extending out of the pipeline is connected with an exhaust valve, and the installation height of the exhaust valve is higher than the upper end plane in the main loop.
6. The low-disturbance high-flow high-speed circulating water tunnel experiment system according to claim 1, wherein an axial flow pump is adopted as the water pump (10), and the inner diameter R of a volute of the axial flow pump isbAnd the inner diameter R of the pipeline of the water pump system section (11)0The relationship of (1) is:
Rb＝k1·R0wherein k is1Is a proportionality coefficient, k is more than or equal to 0.91≤1.2；
The main shaft of the axial-flow pump is driven by a connecting rod, and the connecting rod penetrates through the pipe wall of the rear-mounted backflow square pipe section (6a) and is connected with a variable frequency motor (7).
7. A low disturbance large flow rate high speed circulating water tunnel experiment system according to claim 1, wherein the pressure stabilizing and flow rate regulating system (8) comprises two high pressure tanks (81), the lower side end points of the high pressure tanks (81) are lower than the bottom plane of the main loop pipeline; the bottom of the high-pressure tank body (81) is connected with the throttle valves (82), the output ends of the two throttle valves (82) are respectively connected with the first end of a tee joint, the second ends of the two tee joints are mutually communicated through the flow regulating valve (83), and the third ends of the two tee joints are respectively connected to the main loops of the front and the back of the water pump (10) as the output ends of the pressure stabilizing and flow regulating system (8).
8. A low-disturbance high-flow high-speed circulating water tunnel experiment system according to claim 7, wherein the volume of the high-pressure tank body (81) is VTHere having VT＝0.5·k·V·ΔU/UpK is an adjusting coefficient of 0.7-1.4, V is the volume of water contained in the main loop, delta U is the variable flow rate range required by the system, and U is the variable flow rate range required by the systempTo design the flow rate.
9. The low-disturbance large-flow high-speed circulating water tunnel experiment system according to claim 7, wherein a gas-liquid mixed cavity is arranged inside the high-pressure tank body (81), water-insoluble gas is arranged on an interface, and water is arranged below the interface; volume V of water in the pressure vessel at steady statew＝0.5·k·VTAnd k is an adjusting coefficient.
10. A low-disturbance high-flow high-speed circulating water tunnel experiment system according to claim 7, wherein the pipe diameter of the connecting pipeline inside the pressure stabilizing and flow adjusting system (8) is r0And has r0＝0.7·k·R0·ΔU/UpWherein R is0The radius of the pipeline of the experimental pipe section, k is an adjusting coefficient, delta U is a variable flow rate range required by the system, and U ispTo design the flow rate.
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| CN113138063A (en) * | 2020-01-17 | 2021-07-20 | 中国石油天然气股份有限公司 | Phase power device and fluid experimental system |
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| CN115182877A (en) * | 2022-08-18 | 2022-10-14 | 江苏大学 | Water jet propulsion pump test system |
| CN115182877B (en) * | 2022-08-18 | 2024-03-19 | 江苏大学 | Water jet propulsion pump test system |
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