34 results about "Inflow velocity" patented technology

The invention discloses a passive type MEMS flow-induced vibration strengthened heat transfer apparatus and heat transfer method. Through reasonable structural design, a cantilever beam structure fixed on a heat sink can generate a deflection movement far from the heat sink when the temperature of the heat sink increases, and the deflection angle is enlarged along with the increasing of the heat sink temperature. When the deflection angle of the cantilever beam structure is enlarged, an included angle between the length direction and an inflow velocity direction is correspondingly enlarged, so that the vibration of the cantilever beam vibration part is more fierce; therefore, higher disturbance is brought to a flow field close to the cantilever beam, formation of a heat boundary layer is damaged, and strengthened heat transfer is realized finally; the strengthened heat transfer apparatus does not require manual control and external energy input; and instead, the heat dissipation intensity can be adjusted automatically according to the heat sink temperature, so that a new approach is provided to solve a high heat flux problem of modern electronic devices.

The invention provides a manufacturing method of a centrifugal compressor and an impeller. On the side of the negative pressure surface of the vane (16) of the impeller (11), a convex portion (17) is formed in a curved line from the front edge portion (A) to the slit portion (B) at approximately the central portion in the radial direction, and the convex portion ( 17) By forming it so as to form a curve from the slit portion (B) to the rear edge portion, it will be formed at the position where the relative inflow velocity of the fluid flowing to the impeller (11) reaches the Mach number Ma≒1 The convex part (17) can improve the operation efficiency and expand the adaptable flow range, and further realize the improvement of performance.

Disclosed is a positioning device for a free-flying kite-type wind-attacked element that comprises a profiled wing, is used as the exclusive, an auxiliary, or an emergency drive unit, and is connected to a watercraft via a traction rope. The positioning device is provided with a winch that encompasses means which cause the traction rope to be taken in when a given first tractive force is not attained and / or when the flow is about to stop or has stopped abruptly and / or cause the traction rope to be veered when given a second tractive force and / or a given inflow velocity are / is exceeded.

The invention relates to the technical field of pressure testing, in particular to a five-hole probe measurement system integrating calibration data for a wind tunnel test or collection of inflow velocity and angle data during flight of an aircraft. The system is characterized by comprising a five-hole probe and an equipment box, the five-hole probe is in rigid fixed connection with the equipmentbox through a support rod, the equipment box is provided with a system rest button and a working state indicator light, a control circuit board is arranged in the equipment box, and a heat-dissipationvent hole, a stand-by power port, a USB communication serial port and a digital output interface are formed in the side face of the equipment box; a data display screen is arranged on the back face of the equipment box; the control circuit board comprises a minimum system circuit which comprises a micro-processor and a power supply circuit, and an external communication display circuit and a sensor data sampling circuit are arranged on the periphery of the micro-processor. Accordingly, the system reliability is improved, and development and maintenance time cost is lowered; the expandabilityis high, and a flight computer calculated load is lowered.

A centrifugal compressor and a method of manufacturing an impeller, the method wherein a projected part (17) is formed at the approximately radial center part of the impeller (11) on the negative pressure surface side of its a blade (16) so as to form a curve from the leading edge part (A) to the throat part (B) thereof. The projected part (17) is formed to be curved and then to be flat from the throat part (B) to the trailing edge part thereof. The projected part (17) is formed at a position where the relative inflow velocity of the fluid into the impeller (11) is nearly 1 in Mach number Ma. Thus, since an operating efficiency can be increased and an applicable flow range can be increased, the performance of the impeller can be increased.

A turbine impeller supplies a high-pressure fluid through a scroll flow route and / or a exhaust supply port of a fixed nozzle and includes: blade components converting the fluid into a rotational force; and a rotor, configured with the blade components and can rotate around a specified rotational axis, wherein a direction, relative to a gas relative inflow velocity of the rotor, specified by using the fluid supply port as a starting point and subtracting a rotational velocity component of the rotor from a supply velocity component of the fluid is set to not intersect with the rotational axis of the rotor; and a shape, from a halfway portion to a front edge portion, of the blade component inclines, relative to a direction from a center of the rotor to an upstream portion of the blade component, toward front side of a rotating direction of the rotor by a specified angle.

A centrifugal compressor, which is provided with a resistance body that radially narrows the channel section of the air intake channel connecting the rotating blades of the centrifugal compressor and the air inlet, so that the inflow speed of the blade towards the impeller can be increased, Reduce surge limit flow at low flow. The centrifugal compressor is characterized in that it has: a compressor casing (9) having an air inlet (13) and an air inlet passage (11) open to the direction of the rotating shaft; The impeller (7) that compresses the air that flows in from the port (13) is provided with a resistance body (27, 43) to the intake air flow on any part of the inner peripheral wall (23) side part or the center side part of the air intake passage (11). ), when the flow rate is low, by narrowing the cross-sectional area of ​​the air intake channel (11) by the resistance body (27, 43), the inflow velocity of the blade (19) towards the impeller is increased, and the intake air flow is directed towards the blade Hub side or shroud side bias flow of (19).

The invention discloses a non-electrical constant-temperature foot tub, and the foot tub comprises a tub body and a thermal insulation cover plate, wherein a box body is fixed below the thermal insulation cover plate, a water filling nozzle capable of injecting water into the box body is arranged on the thermal insulation cover plate, a valve for releasing water is arranged at the bottom of the box body, and the valve rod top of the valve is extended out of the cover plate and fixedly connected with a rotary knob on the cover plate. In use, hot water appropriate for foot-soaking temperature is poured into the tub body, high-temperature water is injected into the box body through the water filling nozzle on the thermal insulation cover plate, the rotary knob on the cover plate is rotated to open the valve at the bottom of the box body such that the high-temperature water in the box body can slowly flow into the tub body and mix with the hot water therein, when the dissipated heat of the hot water in the tub body and the supplementary heat from the high-temperature water reach a balance state, the hot water in the tub body can keep constant temperature, the water velocity of the valve is controlled by adjusting the rotating angle of the rotary knob, and the inflow velocity of the different high-temperature water can make the hot water in the tub body at different constant temperature.

According to the technology, the invention provides a perpendicular shaft low-wind-speed distributed wind power unit. The perpendicular shaft low-wind-speed distributed wind power unit is a practical and wind-range wind energy utilization device, can be integrated with a building and is safe in operation. The perpendicular shaft distributed wind power unit is characterized in that a structure assembly comprises a perpendicular shaft wind ball wind machine device, a ball-type potential flow cover device and a supporting device at the axial bottom of the ball-type potential flow cover device, wherein the perpendicular shaft wind ball wind machine device is arranged in the center of the ball-type potential flow cover device, the perpendicular shaft wind ball wind machine device and the ball-type potential flow cover device share the same ball center and the same perpendicular main shaft, and the external ball-type potential flow cover device is fixed. According to the main technical feature, the inner arc curved surface concave face of a blade included angle is in the head-on inflow velocity direction, and the outer arc curved surface convex face is in the backflow velocity direction to form rotating torque; meanwhile, the outer arc curved surface convex face forms the flow line curved surface in the main shaft rotating direction, the incident flow surface resistance of a blade in the wind ball rotating direction is reduced, noise is not generated, and the higher pushing resistance ratio is obtained.

The invention provides a large-scale network streaming data cache-write method including that a client side packages collected data and sent the same to a server side; the server side analyzes the received data to determine data resources and unifies data formats; the data with uniform formats are written into cache regions of different inner memories according the data resources; different cache strategies are made according to the data which are written into the cache regions of the different inner memories, and the data meeting strategy trigger conditions are written into a local file system from the inner memories; the data written into the local file system are loaded to a distributed file system or distributed database according to the upper application demand; and to the data which are loaded to the distributed file system or distributed database, small data blocks are combined into large data blocks at fixed time. The large-scale network streaming data cache-write method is applicable to write of large-scale network data that are of different resources and different inflow velocity by the aid of a multi-stage cache mechanism.

The invention discloses a method for reducing the surface resistance based on a plasma exciting device in the technical field of power of aircraft or ground transportation. Through an electrode array arranged on a target plane, a power supply and a controller used for regulating a parameter of the power supply, and different working states of the controller, a period controllable induced fluid is generated on the inner layer of a turbulent boundary layer on the surface of a solid, a bursting process and a downward-sweeping process of the inner layer of the turbulent boundary layer are interfered, the generation and the propagation of a coherent structure and a low-speed streak of the inner layer of the turbulent boundary layer are inhibited, and the effect of reducing the turbulent friction resistance on the surface of the solid is achieved. The plasma exciting device is capable of effectively inhibiting the turbulent friction resistance under a high reynolds number, has the characteristics of simple structure, low energy consumption, stable performance and no additional load, is capable of being actively regulated, and is suitable for a larger inflow velocity without additional parasite drag.

The present disclosure relates to systems and methods for recovering mature fine tailings (MFT) from oil sands tailings ponds. Some examples include a hollow, fully enclosed around its perimeter, ideally of cylindrical form, open bottom structure (a hollow conduit), of predetermined geometry, which is placed at the pond surface. The hollow conduit can penetrate MFT deposits to or below a level at which MFT of required density is located. A width or diameter of the hollow conduit can be determined with respect to the MFT inflow velocity and the corresponding shear rate, so as to enable MFT flow into the hollow conduit at a rate matching a rate at which the MFT is removed from the pond (e.g., a recovery rate). An MFT fill level inside the hollow conduit can be kept constant and equal to a required fill level throughout MFT recovery operations. MFT can enter the hollow conduit during MFT recovery operations solely under action of hydraulic head pressure. MFT can be transferred from within the hollow conduit utilizing a mechanical device such as a pump or a siphon, for transfer to shore based facilities and further processing.

An on-line recovery method for ion exchange resin is preformed in an ion exchange reactor and comprises the following steps: employing desalinized water to perform one-time washing on inactive ion exchange resin, wherein the one-time washing comprises alternative backwashing and forward washing and the water inflow velocity of backwashing is larger than the water inflow velocity of the forward washing; immersing ion exchange resin subjected to one-time washing with an acidic solution; immersing ion exchange resin with a mixed recovery solution composed of a Na2SO4 solution with a mass concentration of 10-12% and a NaOH solution with a mass concentration of 5-6%, and continuously introducing O3 into the ion exchange reactor when immersing; and performing regeneration on ion exchange resin by employing a NaOH solution or a KOH solution. By employing the on-line recovery method for ion exchange resin to perform on-line recovery on inactive resin, resin is used again after majority functions of the resin are recovered, so that the recovery cost is reduced, the service life of ion exchange resin is prolonged, and energy saving, emission reduction, cost reduction and effect improvement are facilitated.

The invention belongs to the field of autonomous underwater vehicle equipment, discloses a flow guiding shield used for an autonomous underwater vehicle and particularly relates to the flow guiding shield used in a propelling system of the autonomous underwater vehicle. A novel practical electrically-driven underwater thruster the application number of which is 200620055186.1 is disclosed in the prior art, and according to the underwater thruster, an axial section of the flow guiding shield is designed in a wing shape, so that the purposes of high efficiency and low power consumption are achieved, but which type of wings should be adopted is not specifically indicated in the prior art, and the defects of poor structural universality and a limited application range still exist. According tothe flow guiding shield, a wing type NACA6721 and a 3D printing technology are adopted for designing the flow guiding shield which is simple in structure and wide in application range, the inflow velocity is increased, the propelling force of propellers is enhanced, the efficiency of the propelling system is improved, vibration of the tail part of the propelling system is reduced, and a great protection function is achieved on the propellers. The flow guiding shield is structurally characterized in that the axial section of an outer shield body is the wing type NACA6721, the angle of attack is 10 degrees, and by adopting a spoke-type structure, not only is the intensity ensured, but also the flow guiding shield is convenient to disassemble and assemble.

A main engine is operated at an efficient rotational frequency to match fluctuations in propeller inflow velocity, and fuel efficiency is increased. The divergence between a rotational frequency command and measured variations in rotational frequency (NE) of a main axle (13) or the main engine (12) is inputted into a proportional-integral-derivative (PID) computation unit (16), and feedback control is performed on the quantity of fuel supplied from a fuel injection device (15) to the main engine (12). The propeller inflow velocity of a propeller (14) is detected and inputted into a computation unit (17). The rotational frequency command is adjusted such that the control point moves along an efficiency curve in response to fluctuations in propeller inflow velocity.