47 results about "Hydrostatic pressure" patented technology

The invention discloses a salt-cavern gas storage sealing performance evaluation method based on gas-water two-phase seepage, and belongs to the technical field of salt-cavern gas storages, the method comprises the following steps: embedding a formula in a fluid-solid-gas coupling theoretical model under a saturated water surrounding rock gas injection and production condition into finite element software, inputting mechanical parameters and pore permeability parameters of rock, and calculating the sealing performance of the salt-cavern gas storage according to the mechanical parameters and the pore permeability parameters; the correction coefficient of the slippage effect on the gas permeability, the gas relative permeability and the pore water relative permeability are obtained; based on the initial stress of surrounding rock, corresponding stratum stress values and hydrostatic pressure values are applied to the top, the bottom and the side faces of a rock stratum respectively, an injection-production air pressure boundary is applied to the surface of a salt cavern cavity, numerical simulation is carried out through a fluid-solid-gas coupling theoretical model and parameters, and the gas seepage velocity is obtained through solving. And evaluating the cumulative gas leakage rate in combination with the cumulative gas leakage rate model. According to the method, the gas seepage behavior under the real working condition is simulated, the slippage effect of the small molecule gas and the gas-water displacement process of the water-saturated rock stratum are considered, and the gas leakage amount evaluation is more accurate.

The invention belongs to the technical field of industrial automation control, and relates to a seasoning filling PID parameter adaptive optimization control method and system. The method comprises the steps that the real-time temperature of fluid in a filling pipeline, the static pressure of a valve inlet, the instantaneous flow and a valve opening instruction are collected, and moving average filtering preprocessing is carried out; constructing a self-adaptive forgetting factor calculation model based on the viscosity-temperature characteristics, and calculating a current optimal forgetting factor according to the fluid temperature change rate, the flow prediction error and the fluctuation condition of the flow data; a recursive algorithm is used for identifying the system process gain online, and the proportional gain of a PID controller is calculated in real time according to the identified process gain and the ratio of the hydrostatic pressure to the standard reference pressure; and the gain is input into a controller, and a final valve opening instruction is generated in combination with integral and differential terms. According to the method, the dynamic adjustment of the algorithm memory length can be realized, the viscosity change can be quickly adapted, excessive filling and slow response are eliminated, and high-precision filling under complex working conditions is ensured.

The invention relates to the technical field of water conservancy projects, and discloses an estuary channel erosion and deposition control method and system based on water column wave energy collection and release. According to the method, wave energy is captured through an oscillating water column air chamber with a bottom opening, bidirectional airflow is converted into unidirectional high-pressure airflow through an airflow rectifying unit, and the unidirectional high-pressure airflow is stored in a high-pressure energy storage container; the system monitors the flow velocity of a channel and the air pressure of the energy storage container in real time, only when the flow velocity meets a preset ebb tide transportation condition and the air pressure is higher than a critical threshold value, a trigger instruction is generated, after the instruction is responded, high-pressure gas is injected into the gas-liquid replacement excitation cavity sinking to the bottom, and water in the driving cavity forms high-speed hydraulic jet flow through a Laval nozzle to impact bottom mud. After jet flow is finished, the cavity exhausts air and relieves pressure, the external water body reversely flows back through the hydrostatic pressure of the environment, and suspended sediment is entrained and sucked. Through the cyclic operation, energy self-sufficiency, intelligent opportunity selection operation and efficient dredging are achieved, the operation cost and the environmental influence are reduced, and the method is suitable for remote and unattended navigation channel maintenance.

This invention relates to a method for evaluating the escape rate of shale gas reservoirs with different dip angles, employing the following technical solution: including the following steps: Step (1) Calculate the drilling angle θ of the plunger sample based on the shale bedding type, calculate the length L of the plunger sample based on the plunger diameter d, and drill the plunger sample based on the drilling angle θ and length L; Step (2) Test the minimum starting pressure P0 of the plunger sample using methane gas; Step (3) Calculate the fluid pressure P of the formation where the plunger sample is located. 流 hydrostatic pressure P 水 Minimum starting pressure P0 and static rock pressure P 岩 Calculate the test pressure Δ for permeability testing p and confining pressure P 围 Step (4) is performed according to the test pressure P determined in step (3). 测 and confining pressure P 围 The permeability of the plunger sample is tested to obtain the permeability k; step (5) calculate the gas escape rate R; step (6) evaluate the shale gas escape capacity of the layer where the sample is located based on the gas escape rate R. The larger the escape rate R is, the stronger the shale gas escape capacity is. Then calculate the shallowest burial depth H where the layer where the sample is located can be effectively preserved.

A method (200) of determining a progress of separation of particles suspended in a liquid in a container (110) of a separation apparatus (100), wherein: said particles are separated from said liquid by sedimentation; said separation apparatus (100) compri- sing a container (110) with a feed inlet and a rotatable rake (120) at its bottom (114); a motor (126) for driving said rake (120); and a pressure measuring device (130), for measuring a hydrostatic pressure at or near the bottom of said container said method (200) comprising: measuring (210) said hydrostatic pressure; driving (220) said rake (120) by means of said motor; obtaining (230) at least one load parameter of said motor (126) during said driving of said rotation; determining (240), especially in real time, a status indicator relating to said separation process, as a function of said hydrostatic pressure and said load parameter, wherein said status indicator comprises: a sedi- mentation index, especially wherein the sedimentation index is indicative of the separation of said particles from said liquid, and / or a feed solid content index, wherein the feed solid content index is indicative of the solid content supplied by said feed.

The utility model relates to an anti-blocking device for a drain loop of a surge tank. The anti-blocking device comprises the surge tank, the condenser is communicated with the pressure equalizing box through a first drainage pipeline; the throttling assembly is arranged on the first drainage pipeline; the second drainage pipeline is connected with the throttling assembly in parallel; and one end of the third drainage pipeline communicates with the first drainage pipeline, and the other end of the second drainage pipeline communicates with the condenser. Two drainage pipelines are additionally arranged on the basis of an original surge tank drainage pipeline, one drainage pipeline is connected with a throttling assembly arranged on the original drainage pipeline in parallel, and therefore when the throttling assembly is blocked in the operation process, pipeline switching can be conducted in time, and smooth drainage is guaranteed; one end of the newly-added drainage pipeline is connected with the original drainage pipeline, the other end of the newly-added drainage pipeline is connected with the position above the liquid level of the condenser, the height of the connecting position of the drainage pipeline and the condenser is correspondingly increased, and the influence of hydrostatic pressure in the condenser on drainage is avoided.

The application provides a multifunctional waterproof structure water vapor permeability comprehensive test device. It belongs to the technical field of building material water vapor permeability testing. The non-uniform water pressure simulation and application system can truly simulate the triangularly distributed hydrostatic pressure borne by the wall in underground engineering through the cooperative design of the tiltable rigid support frame and the pressurized liquid. The test piece installation and inclination adjustment system can simulate the underground continuous wall or the slope retaining wall with different inclinations by adjusting the inclination of the rigid support frame. The non-uniform water pressure simulation and application system can simulate various groundwater conditions from low water level to high water level by adjusting the set value of the fluid pressure system. It can cover various liquid water permeation scenarios, has wide test range and strong applicability. The environment simulation and moisture permeability test system can realize the integrated test and flexible switching of the liquid water barrier and the gaseous water migration performance, complete the test of the two modes on the same test piece in turn, has strong data comparability and high test efficiency.

This invention relates to the field of water purification equipment monitoring technology, and particularly to a multimodal liquid level monitoring method and system based on time-series feature analysis. The method includes: collecting and preprocessing multi-dimensional data through sensors to obtain the original pressure value, real-time water temperature value, real-time TDS value, and current operating condition indicator after interference removal; inputting the original pressure value and water density basic parameters into the hydrostatic pressure formula to obtain the initial liquid level value; combining the real-time water temperature value, real-time liquid level fluctuation frequency, and reference fluctuation frequency to obtain the final high-precision liquid level value; based on the final high-precision liquid level value, real-time TDS value, inlet water pressure data, and current operating condition indicator, calculating the flow rate attenuation score, TDS stability score, and correlation score according to weighted and threshold rules, and combining the three scores to obtain the overall health score; calculating the liquid level change rate and comparing it with a standard range, determining and outputting the anomaly type, and generating control commands. This solution improves the accuracy of liquid level measurement through multi-dimensional liquid level compensation.

The invention discloses a hydrostatic pressure chamber with a degassing device connected at its highest point. The degassing device is connected via a throttle to a tank or to a pressureless leakage area of a hydraulic system in which the pressure chamber to be degassed is arranged.

The invention discloses a device for detecting water pressure outside a tunnel lining and a drainage capacity evaluation method. The method comprises the following steps: constructing a multi-source associated basic data set based on original data collected by a portable device; generating a data stability evaluation result by using time sequence stability evaluation and working condition correlation analysis, and screening a credible test section; a self-adaptive multi-working-condition response model is constructed, and a working-condition external water pressure field is reconstructed and designed through weighted regularization inversion; constructing an external water pressure and drainage capacity coupling model, and performing inversion to generate equivalent drainage capacity parameters by using a global optimization algorithm of proxy model acceleration and spatial smooth constraint; and finally, comprehensively outputting a structure safety evaluation suggestion. The real hydrostatic pressure is obtained through the sealed inverted filter structure of the device, the problems that short-term data interference is large, working condition extrapolation is difficult and inversion is discontinuous are solved in combination with a space coupling inversion algorithm, and high-precision reconstruction of external water pressure and whole-line diagnosis of drainage performance are achieved.

The invention relates to a deep sea power push rod testing device and method, and relates to the technical field of deep sea equipment, and the device comprises a power push rod, a channel control module, a pressure balance cylinder, a storage cylinder and a hydrostatic pressure tank; the access control module is provided with three conduction ports, and the three conduction ports are connected with the power push rod, the pressure balance cylinder and the storage cylinder correspondingly. Three conduction ports of the access control module are controlled by electromagnetic valves; the hydrostatic pressure tank is used for providing preset working water pressure; when the electromagnetic valve is powered on to act, the pressure balance cylinder communicates with the power push rod, liquid in the pressure balance cylinder is pressed into the power push rod based on the working water pressure of the hydrostatic pressure tank, and a telescopic rod of the power push rod is pushed outwards under the action of the internal and external pressure difference. When the electromagnetic valve is powered off, the storage cylinder communicates with the power push rod, and the telescopic rod of the power push rod retracts under the action of external working water pressure and presses liquid in the power push rod into the storage cylinder.

This invention discloses a method for predicting formation pore pressure in fractured reservoirs, relating to the fields of oil and gas exploration and development and geophysical logging technology. The method includes obtaining logging and geological parameters of the target formation; establishing a relationship between pore pressure and fracture aspect ratio based on the effective stress principle and fracture mechanics; calculating the theoretical P-wave velocity under different pore pressure conditions within a pressure range defined by hydrostatic pressure and normal stress on the fracture surface, using an equivalent medium model and the Gassmann equation; determining the pore pressure based on the residual between the theoretical and measured P-wave velocities; and comparing the calculated pore pressure value with the measured pressure value to establish an evaluation relationship. This invention has the advantages of reducing unnecessary and ineffective calculations, improving the stability and speed of the calculation process, and enhancing the physical rationality of the results.

The invention discloses an in-situ liquid level meter based on a pure mechanical pressure conversion mechanism and a measuring method thereof, the in-situ liquid level meter comprises a liquid level meter body composed of a meter shell, a glass mask, a dial and a pointer, and a pressure sensing diaphragm is arranged in an interface of the liquid level meter body; one end of the pressure sensing diaphragm is connected with a multi-stage lever and a gear transmission mechanism in the liquid level meter body, and the other end of the pressure sensing diaphragm extends out of the interface and is provided with a protective sleeve for protection; during actual use, the liquid level meter body is connected with a connection point of a measured container by adopting a pressure guide pipe or a flange, accurate conversion from pressure to liquid level and on-site display are realized through a pure mechanical structure based on a relation P = rhogh between hydrostatic pressure and liquid level height, the problems of interference, energy consumption, potential safety hazards and the like caused by electronic elements are avoided, and the liquid level meter is simple in structure and convenient to use. The adaptability, the stability and the reliability of liquid level measurement are improved. Meanwhile, by improving the connection mode with the tested container, the sealing performance, the adaptability and the stability of the connection are enhanced.

To provide a slit type dynamic and static water pressure gauge having a simple structure, capable of being manufactured at a low cost, and having high practicality capable of excellently measuring, for example, even a river, a water channel or the like in which sediment, refuse or the like flows.SOLUTION: This device is provided with a hollow cylindrical body 14 arranged in a fluid and provided with a slit 12 opposed to the direction of the flow of the fluid, and a measuring instrument housing part 16 internally communicating with the hollow cylindrical body 14 via a communication opening part 20 and forming a housing space 22 closed except the communication opening part 20. The hollow cylindrical body 14 is formed in a straight cylindrical shape, and the slit 12 is preferably provided long in parallel with the center axis.SELECTED DRAWING: Figure 1

This invention discloses a method for calculating the impact pressure of an open cavity entering the water under wave conditions, relating to the field of marine engineering technology. It is used to predict the entry process of an open cavity into the water. The method includes constructing a geometric model of the open cavity, constructing a wave field, simulating the motion of the target cavity entering and within the wave field, constructing the time-domain motion equation of the target cavity, solving the time-domain motion equation of the target cavity using numerical integration, calculating the hydrostatic pressure component, the impact pressure component, the air wave pressure component, and the wave-induced pressure component of the target cavity, and decoupling the calculation of the impact pressure based on these four sub-components. This invention improves the accuracy of calculating the impact pressure distribution and time history characteristics of an open cylindrical cavity under wave conditions by establishing a coupled dynamic model of the wave field and the entry process of the open cavity through a multi-phase coupling mechanism.

The application discloses a kind of measuring device and method of rock porosity under high hydrostatic pressure, it includes autoclave (5), rock sample (17) is fixed in autoclave (5), and the one end of autoclave (5) is connected with first valve (3) with plug (15);First valve (3) is connected with second valve (2);Second valve (2) connects manual liquid pressurizing pump (1);The other end plug (19) of autoclave (5) is connected with four-way valve (6);Four-way valve (6) one end connects vacuum pump (8), the other end connects second needle valve (9), and second needle valve (9) is connected with third three-way valve (11);Third three-way valve (11) is connected with third needle valve (12);Third needle valve (12) is connected with argon cylinder (14) by pressure reducing valve (13);Prior art does not have the device and method for measuring rock porosity under high hydrostatic pressure, using measurement under normal temperature and pressure environment cannot achieve the technical problems such as the like.

The invention specifically discloses an SPH-based debris flow water tank experiment simulation method, and relates to the technical field of geological disaster simulation and fluid dynamics. The method comprises the following steps: S1, inputting water tank size parameters according to experimental requirements and generating a water tank model terrain; s2, debris flow rheological parameters are input, and solid-liquid two-phase SPH particles are generated; s3, applying wall surface repulsive force according to the geometrical morphology of the water tank and the accumulation area so as to set normal boundary conditions, defining an initial velocity field and hydrostatic pressure distribution, adopting an improved solid-phase fractional coupling friction-turbulence model and an SPH method for coupling solution, and calculating debris flow flowing and interaction; and S4, outputting a simulation result. According to the method, the problems of high cost, complex operation, long period and potential safety hazards of a traditional physical experiment are solved, the rheological characteristics and the movement law of the debris flow are accurately described, a high-precision numerical simulation means is provided for the experiment, and disaster mechanism research and disaster prevention and reduction measure formulation are assisted.

Flexible containment tubes form sections of a dike for fluid containment. For example, multiple vinyl-coated polyester tubes with a 19-inch diameter may be filled with water and stacked on top of each other to create a temporary diversion dike. Multiple sections of dike may be abutted together to form longer sections of dike. A vapor barrier or plastic membrane may wrap over dike sections and / or weaved through the flexible containment tubes as they are placed prior to filling. Configurations of the vapor barrier and associated anchoring mechanisms improve the utility of dike sections by reducing hydrostatic pressure of contained fluid on the dike, harnessing the weight of fluid columns, and mitigating seepage through the dike sections.

Method for introducing at least one liquid infiltration medium (3) into an aquifer (15) by means of an infiltration-side pipe or shaft connection which has an infiltration lance (5B), the at least one liquid infiltration medium (3) to be introduced is fed via the infiltration lance (5B), the infiltration lance (5B) is further inserted into a subsurface (11) until a pressure equalization (13) occurs between the hydrostatic pressure of the aquifer (15) and a predetermined flushing pressure, and thus the at least one liquid infiltration medium (3) to be introduced is fed into the aquifer (15) via the infiltration lance (5B).

The application relates to the field of automatic control, and discloses a valve regulation method and system based on deep-sea environmental pressure self-adaptive regulation, which comprises the following steps: synchronously collecting flow field disturbance state, external hydrostatic pressure evolution characteristics and speed change information in the diving process of a water area where a valve is located, and generating environmental response characteristic parameters; performing disturbance level division on pressure change behavior, and forming a hierarchical linkage control structure; combining the hierarchical linkage control structure, determining the disturbance level of the current water area, and generating subsystem trigger instruction information; when the disturbance level corresponding to the subsystem trigger instruction information satisfies a preset switching condition, corresponding pressure regulation control instructions are generated; in the process of executing pressure regulation by the regulation execution subsystem according to the pressure regulation control instructions, a feedback regulation mechanism is formed by combining valve internal and external pressure difference feedback information and safety pressure interval constraints. The application has the advantages of improving the hierarchical response and self-adaptive regulation capability of the valve to deep-sea transient pressure difference disturbance.

The application discloses a salt cavern gas storage sealing evaluation method based on gas-water two-phase seepage, and belongs to the technical field of salt cavern gas storage, and the method comprises the following steps: embedding a formula in a fluid-solid-gas coupling theory model under water-saturated surrounding rock injection and production conditions into finite element software, inputting mechanical parameters and porosity and permeability parameters of rock, and a correction coefficient of gas permeability, gas relative permeability and pore water relative permeability of a slippage effect; based on the initial stress of the surrounding rock, corresponding stratum stress values and hydrostatic pressure values are respectively applied to the top, bottom and side of the rock stratum, an injection and production pressure boundary is applied to the surface of the salt cavern cavity, numerical simulation is carried out by using the fluid-solid-gas coupling theory model and parameters, gas seepage velocity is obtained by solving, and gas cumulative leakage is evaluated in combination with a gas cumulative leakage model. The method simulates the gas seepage behavior under real working conditions, considers the slippage effect of small molecule gas and the gas-water displacement process of water-saturated rock stratum, and is more accurate in gas leakage evaluation.

The application relates to a method and system for predicting the dynamic characteristics of a bubble near a water boundary considering phase transition effects, and relates to the field of cavitation bubble dynamics. The method solves the problems that existing analytical models are difficult to accurately reflect the deformation and migration track of a bubble when dealing with the bubble near a boundary, and the prediction results deviate from the actual situation, because the wall effect and the non-uniformity of a flow field are ignored. The method comprises the following steps: inputting initial conditions and environmental parameters of the bubble; calculating a boundary-induced flow field pressure; calculating a flow field environmental pressure based on the boundary-induced pressure and the hydrostatic pressure; calculating the internal pressure of the bubble based on the thermodynamic phase transition effect; calculating the enthalpy difference of the bubble surface based on the flow field environmental pressure and the internal pressure of the bubble; substituting the obtained result into a unified form of a bubble equation considering phase transition and migration effects and solving the bubble equation to obtain the equivalent radius and migration distance of the bubble changing with time. The method is also suitable for the field of predicting the equivalent radius calculation of a single cavitation bubble during boundary movement.

This invention attempts to address the problem of hydraulic discontinuity by combining two methods. The reduction of fluid density is promoted by diluting the inhibitor product with a water-based fluid and increasing the fluid flow rate. The first method reduces the hydrostatic pressure gradient in the injection line, while the second method increases the pressure drop due to friction in the line. This combined effect prevents hydraulic discontinuity in the injection. To this end, the invention incorporates an industrial water tank, pump, and line fitting (flow rate T) on ground equipment. This assembly is used to dilute the inhibitor in the injection line while ensuring a minimum inhibitory concentration.

The utility model relates to the field of pump bodies, in particular to a valve body assembly with a water sealing effect and a water pump thereof, the valve body assembly comprises a top cover, a valve plate and a valve seat which are sequentially assembled from top to bottom, the valve plate is assembled on the surface of the valve seat and covers the upper end face of an inner surrounding water outlet waterway and the input end of an independent water outlet waterway, and meanwhile the valve plate further covers the lower portion of a water sealing cavity; water flow enters the peripheral water inlet waterway from the first water inlet and enters the water sealing cavity through the communicating notch at the same time, the water flow entering the water sealing cavity provides pressure and presses the upper surface of the valve plate downwards, and when the water pump is in a non-working state, one part of the water flow enters the peripheral water inlet waterway, and the other part of the water flow enters the water sealing cavity through the communicating notch. Water flow in the water sealing cavity exerts downward pressure on the valve plate, so that the valve plate is tightly attached to the input ends of the inner water outlet waterway and the independent water outlet waterway, and effective sealing is formed. Along with the increase of the external hydrostatic pressure, the pressure borne by the valve plate is further enhanced, so that the leakage stopping effect is greatly improved.

The present invention generally relates to energy usage in a start-stop mechanism when circulating fluid to a raised container, and more particularly to a method for operating a start-stop mechanism without any influence from hydrostatic pressure, wherein the plurality of input connections and output connections are operably connected to at least one closed container, each closed container has at least one input and at least one output operably connected to a pressurization system and at least one input and at least one output operably connected to another pressurization system having a pressure difference.

The present application relates to the technical field of intelligent sensor measurement, in particular to a kind of intelligent groundwater combined measurement method.The specific implementation process includes: detecting and filtering current atmospheric pressure, setting pressure zeroization reference;Utilize the scale pressure cooperative measurement to generate liquid level scale value, and compensate and correct by fusing hydrostatic pressure value, output dynamic liquid level depth;Utilize the bottoming pressure measurement to identify bottoming event, and lock the maximum hydrostatic pressure value to convert total liquid column height;Total depth value is calculated by combining liquid level scale value and total liquid column height, integrated as combined measurement data;When liquid level occurs overrun fluctuation, automatically trigger alarm.The present application combines high-precision scale positioning, dynamic pressure sensing and intelligent judgment, effectively improves the problem of single dimension, easy to be disturbed by environment and unable to obtain well depth full parameter in sensor measurement process, significantly improves the integration and accuracy of sensor measurement.

This invention provides a valve wear and corrosion testing device, method, and application simulating a deep-sea environment. The device includes: a pipeline circulation module for connecting the valve to be tested, providing a flow path for the corrosive medium, regulating hydrostatic pressure, and measuring flow rate data; an environmental control module for regulating the temperature, salinity, pH value, and gas component content of the corrosive medium to simulate the service environment of a deep-sea target; a friction control module for driving the valve stem and valve core to reciprocate, applying mechanical loads, and collecting vibration signals; and a data processing module for calculating leakage, determining wear status based on flow fluctuation ratio, identifying failure by comparing vibration curves, and assessing remaining life based on a multi-factor damage prediction model. This invention achieves valve wear and corrosion performance testing and life prediction under a multi-factor coupled environment in the deep sea, improving the accuracy of the assessment.

The invention discloses an FLNG-LNGC combined operation platform passive vibration reduction system based on anti-resonance tuning. The system comprises a main hydraulic conversion unit, a hydrostatic pressure sensing variable stiffness unit, a pressure sensitive type variable inerter unit and a differential type clearance fluid capture damping unit. The main hydraulic conversion unit converts vertical motion of the hull into hydraulic circuit fluid flow. The hydrostatic pressure sensing variable stiffness unit adjusts the loop stiffness through external water pressure. The pressure-sensitive deformation inerter unit compresses a fluid channel through external water pressure to reduce the sectional area, so that the fluid inertia coefficient is remarkably increased along with increase of draught. According to the method, the parameter evolution relation that the fluid inertia coefficient growth rate is larger than the rigidity growth rate is constructed, so that the inherent frequency of the system is automatically reduced along with the increase of the draught, the frequency drift caused by the increase of the loading capacity of the FLNG is passively tracked, the interstitial resonance is effectively inhibited, external energy sources are not needed, and the environmental adaptability is high.

The invention relates to a back pressure balancing device and method for measuring pulsating pressure in a cavitation water cylinder, and the device comprises a pressure balancing tank which is a closed rigid container, the interior of the container is connected with a cavitation water cylinder pressure regulating tank through a ventilation pipeline, and the pressure balancing tank is used for transmitting the pressure of the cavitation water cylinder pressure regulating tank to the pressure balancing tank; the gauge pressure sensor is located underwater, a first side of a sensitive element of the gauge pressure sensor receives pressure generated by water in the cavitation water cylinder, and the pressure comprises cavitation water cylinder back pressure, hydrostatic pressure and pulsating pressure induced by a propeller; one end of the backpressure cavity container pipeline is communicated with the interior of the pressure balance tank, the other end of the backpressure cavity container pipeline is communicated with a backpressure cavity located on the second side opposite to the first side of the sensitive element of the gauge pressure sensor, and pressure in the pressure balance tank is conducted to the backpressure cavity of the gauge pressure sensor. The technical problems that when the pressure of the cavitation bubble water cylinder is adjusted in a test, the back pressure of the gauge pressure sensor is fixed, so that the back pressure interferes with pulsating pressure measurement, and the precision is insufficient can be solved.