14 results about "Jet stream" patented technology

The embodiment of the invention provides a low-altitude torrent and typhoon refined monitoring method and system, and is applied to the technical field of meteorological monitoring. The method comprises the following steps: acquiring cloud air guide data; time downscaling processing is carried out on the cloud guide wind data based on an RIFE model, and a high-resolution wind field sequence is generated; inputting the high-resolution wind field sequence into a pre-trained E3D-LSTM model, and outputting forecast wind field data; and respectively inputting the high-resolution wind field sequence and the forecast wind field data into a pre-trained Deeplabv3 + semantic segmentation model to obtain a low-altitude jet flow core area and a typhoon key area at corresponding moments so as to obtain an overall structure and an evolution trend of the wind field. In this way, an efficient and intelligent new normal form can be provided for refined monitoring and early warning of disastrous weather.

The present application belongs to the technical field of geotechnical engineering and indoor test, and provides a visual test device and method for interaction between high-pressure rotary jet flow and soft soil, which comprises a detachable model box, a jet medium simulation system, a high-pressure rotary jet flow generation system, an overburden pressure simulation system, a data acquisition system and a tracing system.The test device has the advantages of high visual degree, detachability, easy assembly and easy production.The jet medium simulation system has significant shear thinning characteristics, and has a high degree of reduction of the non-Newtonian fluid properties of cement slurry, which not only overcomes the problem of easy blockage of the pipeline, but also avoids distortion defects.The trajectory of the fluorescent powder particles in the jet medium simulation system can be captured by a high-speed camera under the irradiation of the pulsating laser beam generated by the pulsating laser, so as to accurately reproduce the flow field information of the high-pressure rotary jet flow in the soft soil.

The invention discloses a longitudinal wave dispersion and attenuation calculation method based on jet flow and wave-induced flow coupling. The method comprises the following steps: establishing a unified coupling model of fluid saturation periodic layered medium microscopic jet flow and mesoscopic wave-induced flow; setting a stiffness matrix and boundary conditions of the unified coupling model; establishing a unified coupling model constitutive equation; calculating each parameter of the stiffness matrix; calculating a longitudinal wave speed and a transverse wave speed when incident at any angle; and frequency dispersion and attenuation of the longitudinal wave velocity and the transverse wave velocity during incidence at any angle are calculated. According to the method, the change of the longitudinal wave speed and the transverse wave speed in the model is calculated by calculating the stiffness matrix of the fluid saturated periodic layered medium microscopic jet flow and mesoscopic wave induced flow unified coupling model, so that the speed dispersion and energy attenuation characteristics and the change rule of the longitudinal wave and the transverse wave when the longitudinal wave and the transverse wave are incident at any angle are analyzed.

An altitude movement device comprising of a ballonet within an outer envelope with the ballonet configured to control buoyancy and an apparent wind generating device combined with the altitude movement device to generate an apparent wind to propel the vehicle laterally with respect to the direction of the jet stream.

This invention provides a method, apparatus, and equipment for rainfall forecasting in plains areas, relating to the field of weather forecasting technology. The method includes: detecting the circulation pattern of the area to be forecasted to determine if it belongs to a typical rainfall circulation type; if the circulation pattern belongs to a typical rainfall circulation type, obtaining the rainfall triggering conditions corresponding to the circulation type, as well as the low-level jet stream characteristics and vertical wind shear characteristics of the area to be forecasted; if the low-level jet stream characteristics and vertical wind shear characteristics meet the rainfall triggering conditions, determining that rainfall will begin in the area to be forecasted after a set duration, and determining the rainfall intensity level and duration based on the low-level jet stream characteristics and vertical wind shear characteristics. This invention can improve the accuracy of rainfall forecasting in plains areas.

The invention belongs to the technical field of seismic exploration, and relates to a porous rock seismic wave propagation characteristic simulation method based on multi-mechanism coupling, which comprises the following steps: simulating the propagation of seismic waves in viscoelastic porous rock by adopting a seismic wave propagation model; wherein the modeling process of the seismic wave propagation model comprises the following steps: coupling a jet flow mechanism with a Biot theory framework; the method comprises the following steps: representing the inherent viscoelasticity of a solid skeleton by adopting a Zener model, and coupling with a jet flow mechanism and a Biot theoretical framework to obtain a total volume modulus and a total shear modulus; calculating a memory variable according to the total volume modulus and the total shear modulus; obtaining a time domain relaxation function containing a memory variable; substituting the time domain relaxation function containing the memory variables into the frequency domain stress-strain relation to obtain a time domain speed-stress equation set containing all the memory variables; and obtaining a seismic wave propagation model by combining the first-order differential equation of the memory variable. According to the invention, wave field characteristics such as reflection and diffraction in a complex heterogeneous medium can be accurately and comprehensively simulated.

The present application relates to a kind of double-scale full-band petrophysical modeling method, which is according to the inversion of target area rock P-wave and S-wave velocity, obtains the distribution of rock soft porosity and soft pore aspect ratio under different pressure;According to the distribution of rock soft porosity and soft pore aspect ratio, the frequency-dependent rock wet skeleton considering all aspect ratio soft pore jet flow effect is calculated using jet flow model;The frequency-dependent rock wet skeleton is brought into the frequency-dependent bulk modulus model of patch-saturated rock, and the petrophysical model considering micro and macro scale wave-induced flow effect is obtained.The present application comprehensively considers the influence of micro jet flow effect and mesoscale patch saturation, simulates the dispersion attenuation phenomenon caused by complex pore structure and complex fluid distribution of actual rock, and is more in line with the pore structure and fluid distribution in actual reservoir rock.

The invention provides an environmental wind field-oriented cascaded low-altitude torrent probability prediction method, and belongs to the field of atmospheric environment and weather forecast. According to the invention, a cascaded prediction means is adopted to realize driving by sea level air pressure field data, and a scheme for predicting whether low-altitude torrent occurs or not and the probability of the prevailing wind direction is realized, wherein the scheme is rapid, efficient, lightweight and capable of being updated in a rolling manner. Comprising the following steps: S1, identifying low-altitude jet stream and extracting a prevailing wind direction; s2, screening key space modals significantly related to the low-altitude torrent; s3, constructing a multi-classification logistic regression model; s4, constructing a time sequence prediction model; s5, real-time data assimilation and principal component value prediction are carried out; step S6, low-altitude jet stream probability prediction; and S7, real-time and rolling updating of a prediction result is carried out.

The application discloses a brine layer wide-band rock physical modeling method considering salting-out effect and belongs to the technical field of seismic rock physics research. The method comprises the following steps: S10, an equivalent elastic modulus of a brine layer rock matrix is calculated by using a Voigt-Reuss-Hill model; S20, an equivalent elastic modulus of a brine layer rock skeleton is calculated by using a jet flow model; S30, a modified porosity and permeability are calculated by considering the salting-out effect caused by supercritical carbon dioxide injection; and S40, an equivalent elastic modulus of a saturated rock is calculated by using a patch saturation model. The application considers the salting-out effect caused by supercritical carbon dioxide injection into a brine layer, quantifies the influence of the salting-out effect on the porosity and permeability parameters of the brine layer, combines rock physical modeling, and proposes a more accurate wide-band rock physical modeling method of the brine layer, so that the elastic response of a deep brine layer after supercritical carbon dioxide injection can be quickly and accurately calculated, and a theoretical basis is provided for deep brine layer carbon dioxide geological storage effectiveness monitoring and evaluation.

The invention provides a device and method for measuring jet flow total pressure in a large-flow lateral jet flow test, the device comprises a model storage chamber, a total pressure probe and a pressure sensor, one end of the model storage chamber is provided with a mounting port, the total pressure probe is mounted in the mounting port, the detection end of the total pressure probe extends into a detection chamber of the model storage chamber, and the pressure sensor is arranged in the detection chamber. The pressure sensor is fixedly installed at the end, located outside the model storage chamber, of the total pressure probe, the other end of the model storage chamber is communicated with the air supply pipeline, and a jet flow opening communicated with the jet pipe is formed in the position, corresponding to the detection end of the total pressure probe, of a detection cavity of the model storage chamber. According to the method for measuring the jet total pressure, the flow state in the model storage chamber is simulated through numerical simulation, pressure distribution of the model storage chamber is obtained, so that the positions of pressure measuring points are accurately screened, a total pressure probe is designed on the basis, the total pressure at the measuring points can be transmitted to a pressure sensor, and then more accurate jet total pressure data compared with a traditional method are obtained.

The application discloses a diffusion type energy dissipater, which comprises a flow guide cover, an energy dissipater body, a plurality of spray holes and an energy dissipater net. The energy dissipater body is in sealing connection with the inlet end of the flow guide cover, and the spray holes are arranged on the energy dissipater body and are in communication with the flow guide cover and the energy dissipater body. The energy dissipater body can intercept water flow and spray the water flow outward through the spray holes to form high-speed jet flow. The energy dissipater net is arranged in the flow guide cover and is used for receiving the jet flow from at least part of the spray holes. The energy dissipater body of the application adopts a conical diffusion energy dissipating section and a blocking section. The conical diffusion energy dissipating section gradually reduces the flow area of water bodies, and can rapidly form high-pressure liquid under the cooperation of the blocking section, which is beneficial to forming high-speed jet flow at the spray holes. The high-speed jet flow can hit the energy dissipater net and the flow guide cover, so that the energy dissipating effect is achieved.

This invention discloses a low-altitude wind shear recognition system and method based on convolutional neural networks, belonging to the field of meteorological monitoring technology. The system includes: a low-altitude wind shear dataset construction module, which generates a wind shear image dataset containing crosswind shear, low-altitude jet stream, headwind and tailwind shear, and micro-downbursts; a data preprocessing module, which performs preprocessing on the images; a convolutional neural network module, which incorporates a lightweight convolutional neural network with a progressive channel design, trained using a two-stage transfer learning strategy, and utilizes an improved loss function obtained by weighted summation of cross-entropy loss, flow direction consistency constraint loss, and global vortex intensity constraint loss to obtain a wind shear recognition model; and a wind shear intelligent classification module, used to identify the type of wind shear in low-altitude wind field images in real time. This invention has the advantages of high recognition accuracy, low computational load, good real-time performance, and low hardware cost, and can effectively ensure the flight safety of UAVs in complex low-altitude wind field environments.

This invention discloses a method and apparatus for predicting the P-wave velocity and attenuation of hydrate reservoirs based on jet flow theory. The method treats hydrates as part of a solid framework, calculates the modified dry rock framework modulus of hydrate-bearing reservoirs using jet flow theory, and finally establishes the P-wave velocity and attenuation values ​​of the hydrate reservoir based on the relationship between wave number, wave velocity, and attenuation. This invention's method for predicting the P-wave velocity and attenuation of hydrate reservoirs considers the characteristics of hydrates as a solid framework and the influence of jet flow effects, thereby improving the accuracy of P-wave velocity and attenuation prediction for hydrate reservoirs.

The embodiment of the invention provides a modeling method and device for a three-phase fluid saturated fractured reservoir. The method comprises the steps that the equivalent bulk modulus, the equivalent shear modulus and the equivalent viscosity of oil-water mixed liquid fluid in the fractured reservoir, the jet flow action numerical value and the patch saturation action numerical value in a rock matrix and the equivalent bulk modulus of three-phase mixed fluid in the fractured reservoir are obtained; the rock physical model of the three-phase fluid saturated fractured reservoir is constructed according to the equivalent shear modulus, the equivalent viscosity and the disturbance quantity caused by the fractures. According to the method, multiple physical mechanisms of seismic waves in the propagation process of the three-phase saturated fractured reservoir are fused, the reasonability and feasibility of modeling of the three-phase saturated fractured reservoir are improved, and the purpose of constructing the rock physical model of the three-phase fluid saturated fractured reservoir is achieved.