8results about How to "Good flame stabilization effect" patented technology

The invention provides a pollutant spatial distribution and blow-off and tempering limit measurement method based on a flat flame burner, and relates to the technical field of combustion experiment measurement. According to the method, on the basis of a flat-flame burner, a quartz cover is arranged above the flat-flame burner to form a locally-closed space, and a long-strip-shaped measuring window is formed in the side face; an X-Y plane movable precision probe structure is arranged on the outer side of the window, so that the tip of the sampling probe can extend into a region adjacent to the flame at any coordinate point in the window plane; a camera is arranged on the outer side of the quartz cover, and a camera pixel coordinate probe physical coordinate conversion relation is established through calibration; controlling the probe to move point by point according to a preset scanning path, synchronously collecting pollutant concentration and flame images, and obtaining a pollutant two-dimensional or three-dimensional distribution field under a given working condition; parameters such as gas flow and air-fuel ratio are adjusted, the blow-off / tempering limit is approached and crossed, scanning is repeated at key nodes, and pollutant distribution characteristics in different combustion stability states are obtained.

This invention discloses a porous rectifying structure for the afterburner of a variable cycle engine, comprising a rectifying orifice plate installed in an annular channel between the turbine outlet and the flame stabilizer. The orifice plate is symmetrically arranged along its radial central axis, with the clogging area facing the turbine inflow and axially aligned with the heat shield inlet. The orifice plate height is 2 / 3 of the channel height between the central cone and the heat shield. The plate has uniformly distributed pores with an equivalent diameter of 10-20 mm along the radial direction, with a clogging ratio of 5%-25%. This invention forms a multi-stage mixing interface through the radially gradient porosity pore arrangement, promoting shear mixing of the high-temperature internal combustion gas and the external bypass gas. Simultaneously, the static pressure difference across the orifice plate drives the external bypass gas flow into the heat shield cooling channel, increasing the cooling flow rate, improving the uniformity of the upstream velocity field of the flame stabilizer, eliminating the recirculation zone inside the heat shield, reducing the thermal load on the casing wall, and controlling the total pressure loss to within 3%, achieving high-stability combustion and reliable thermal protection under a wide bypass ratio.

The utility model provides an inner ring fire cover and a combustor, and relates to the technical field of cooking utensils. The inner ring fire cover comprises an upper fire cover and a lower fire cover, the bottom of the upper fire cover is provided with a plurality of concave grooves, the upper fire cover detachably covers the lower fire cover, and groove fire holes are formed through the grooves. The top face of the lower burner cap is provided with a first inclined face arranged in an inclined mode and a first plane arranged in the horizontal direction, the bottom face of the upper burner cap is provided with a second inclined face arranged in an inclined mode and a second plane arranged in the horizontal direction, the first inclined face is attached to the second inclined face, and the first plane is attached to the second plane. The groove fire holes are arranged in the groove fire holes, so that the first hole sections which are obliquely arranged upwards and the second hole sections which are horizontally arranged are formed in the groove fire holes, the resistance of fuel gas flowing out of the groove fire holes is increased, the flame leaving problem is solved, the fuel gas flows out in the horizontal direction at the outlets of the groove fire holes, flames are pressed downwards, and the flames at the roots of the outlets of the groove fire holes are diffused towards the left side and the right side. And the flame stability of the root of the flame is improved.

The utility model provides an inner ring fire cover and a combustor, and relates to the technical field of cooking utensils. The inner ring fire cover comprises an upper fire cover and a lower fire cover, the upper fire cover detachably covers the lower fire cover to form a center cavity and a plurality of groove fire holes, the top face of the lower fire cover is provided with a limiting part protruding outwards, and the bottom face of the upper fire cover is provided with a limiting groove which is concave inwards and matched with the limiting part. The limiting part is inserted into the limiting groove to limit relative movement of the upper burner cap and the lower burner cap, so that deviation of the upper burner cap and the lower burner cap is prevented, targeted key protection on the ignition hole is facilitated, the ignition effect is improved, flame separation or fire leakage caused by deviation can be avoided, and the external environment interference resistance is higher. The limiting parts and the limiting grooves are simple in structure and convenient to manufacture, and production cost is saved. The bottom face of the limiting groove is provided with an inwards-concave groove, the top face of the limiting part is attached to the bottom face of the limiting groove, so that an ignition hole is formed in the groove, the ignition hole is detachable, and cleaning of the ignition hole is facilitated after the ignition hole is blocked by oil dirt or overflowing liquid.

The present invention relates to a flame-stabilizing fire cover, comprising a cylindrical fire cover body, the inner cavity of which forms a gas mixing cavity, and a main fire hole and a flame-stabilizing hole are respectively opened on the peripheral wall thereof, the main fire hole and the flame-stabilizing hole are respectively communicated with the above-mentioned gas mixing cavity, the flame-stabilizing hole is arranged at intervals from the main fire hole and is located below the main fire hole, the bottom wall of the outer end of the channel of the flame-stabilizing hole is notched and suspended to form a flame-stabilizing open section. Compared with the prior art, the flame-stabilizing hole in the present invention can heat the root of the main fire hole, and better play the effect of stabilizing the flame, and the bottom wall of the outer end of the channel of the flame-stabilizing hole is notched and suspended to form a flame-stabilizing open section, by setting the flame-stabilizing open section, not only can the wall-adhering effect of the overflow liquid be blocked, thereby preventing the overflow liquid from flowing into the channel of the flame-stabilizing hole, and completely preventing the overflow liquid from clogging the flame-stabilizing hole, but also the flame-stabilizing open section is provided, so that the flame-stabilizing airflow in the channel of the flame-stabilizing hole can be expanded and decelerated in the flame-stabilizing open section, thereby improving the flame-stabilizing effect.

The utility model provides a burner fire cover, burner and gas stove including the burner fire cover, the burner fire cover comprises an inner ring fire cover and a cap, the side wall of the inner ring base is provided with a plurality of main fire holes, the cap is covered on the top of the inner ring base, the bottom wall of the cap extends downwards to form a first ring wall, the first ring wall is provided with a plurality of main fire holes, and the second ring wall is provided with a plurality of main fire holes. The first ring wall is located on the inner side of the side wall of the inner ring base, first air outlet channels arranged in the circumferential direction of the first ring wall are formed in the first ring wall, and the opening area of the first air outlet channels in the inner wall face of the first ring wall is smaller than the opening area of the first air outlet channels in the outer wall face of the first ring wall. The inner side opening area of the first gas outlet channel is smaller than the outer side opening area of the first gas outlet channel, so that gas is expanded when passing through the first gas outlet channel, the gas speed is reduced, the flame stabilizing performance is improved, and the problem that gas leaves flame due to the fact that the gas flow speed is too high can be solved.

The invention discloses an inner ring fire cover, a combustor comprising the inner ring fire cover and a kitchen range, the inner ring fire cover comprises a plurality of fire holes arranged around the axis of the inner ring fire cover, and the inner ring fire cover comprises a lower cover body and an upper cover body which are detachably spliced with each other in the height direction; an open slotted hole is formed in the surface of the upper cover body or the surface of the lower cover body, and the slotted hole is closed by the opposite splicing surface of the lower cover body or the opposite splicing surface of the upper cover body so that the fire hole can be formed. The extending direction of the groove holes from the inner side inlets to the outer side outlets of the groove holes deviates relative to the radial direction of the inner ring fire cover so as to form opposite outward rotation extension. On one hand, the slotted holes can be cleaned conveniently, attachment of water drops is reduced, on the other hand, the extending distance of the fire holes is increased, and therefore the flame stabilizing performance is still improved under the condition that the size is limited. When energy efficiency conversion is carried out, heat loss from inside to outside in unit time is less.

The utility model discloses an inner ring fire cover and a combustor. The inner ring fire cover comprises a main body; the fire protection structure is connected to the radial side face of the main body and protrudes towards the direction of the central axis of the main body; the fire retaining structure is provided with a fire retaining hole, a buffer hole and an oleophobic hole, the fire retaining hole extends into the fire retaining structure from the surface, far away from the central axis of the main body, of the fire retaining structure, and the oleophobic hole extends into the fire retaining structure from the bottom surface of the fire retaining structure; and the buffer hole extends from the inner surface of the main body into the fire retaining structure and communicates the fire retaining hole with the oleophobic hole. According to the inner ring fire cover, the wall thickness of the inner ring fire cover is effectively increased, a good flame stabilizing effect is achieved, and the stability during combustion is guaranteed.