34 results about "Inflow velocity" patented technology

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 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 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.

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.