JPH05263713A - Mixer nozzle - Google Patents

Abstract

(57) [Summary] [Purpose] To efficiently promote the mixing of the exhaust gas discharged from the exhaust nozzle and the air flowing around the outer periphery of the exhaust nozzle. [Structure] At least one blade-shaped mixer 5 extending in the front-rear direction parallel to the inner surface is provided on the inner surface near the outlet of an exhaust nozzle 1 having an ejector shroud 2. [Effect] When the exhaust gas discharged from the exhaust nozzle 1 passes by the side of the mixer 5, a vortex flow is generated at the blade edge and the blade end of the mixer 5 and flows out rearward, and the vortex-like exhaust gas is exhausted. The air flowing around the outer periphery of the nozzle 1 is engulfed and mixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixer nozzle having a mixer near an exhaust port.

[0002]

Exhaust gas discharged from an exhaust nozzle is
It is a fluid that is discharged at a high speed and has a high energy, and the air flowing around the outer periphery of the exhaust nozzle is a fluid that flows at a low speed and has a low energy as compared with its exhaust gas. If there is a difference in the velocity of the fluid inside and outside the exhaust nozzle, a boundary layer is created there, which reduces the propulsion efficiency of the engine and causes noise.

Therefore, it has been considered to provide a mixer at the outlet of the exhaust nozzle to promote mixing of the exhaust gas inside and outside the exhaust nozzle with air.

FIG. 6 is a sectional view showing an outline of an example of a conventional engine exhaust nozzle, and FIG. 7 is a view taken in the direction of arrows VII-VII in FIG. 6, in which 1 is an exhaust nozzle, 2 is an ejector shroud, 3 Indicates a mixer.

The mixer 3, as shown in FIGS. 6 and 7,
The small-diameter portion and the large-diameter portion are formed in a duct shape alternately arranged in the circumferential direction.

The exhaust gas discharged from the exhaust nozzle 1 is guided by the inner surface of the large diameter portion of the mixer 3 and diffuses outward, and the air flowing around the outer periphery of the exhaust nozzle 1 is Is guided by the outer surface of the small diameter portion toward the center of the exhaust nozzle 1, so that the mixing of the exhaust gas and the air is promoted.

[0007]

However, in the above-described exhaust nozzle, the duct-shaped mixer 3 changes the flow of the exhaust gas and the air, so that the flow passage resistance is large and the thrust efficiency of the engine is adversely affected.

Further, if the length of the mixer 3 is shortened to reduce the resistance, the efficiency of the mixer 3 is lowered, so that there is a problem that there is a limit in reducing the resistance of the mixer 3.

In view of the above-mentioned circumstances, the present invention provides a wing-shaped mixer on the inner surface of the exhaust nozzle to efficiently promote mixing of the exhaust gas discharged from the exhaust nozzle and the air flowing around the outer periphery of the exhaust nozzle. The purpose is to provide.

[0010]

According to the present invention, at least one blade-shaped mixer is provided on the inner surface near the outlet of an exhaust nozzle having an ejector shroud.

[0011]

Therefore, according to the present invention, when the exhaust gas discharged from the exhaust nozzle passes by the side of the mixer, a vortex flow is generated at the blade edge and the blade end of the mixer and flows out rearward to form a vortex-like exhaust gas. The gas entrains and mixes the air flowing around the exhaust nozzle.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the principle of the mixer nozzle of the present invention.

When a blade-shaped mixer 5 as shown in the drawing is provided near the outlet of the exhaust nozzle 1, when the exhaust gas discharged from the exhaust nozzle 1 passes by the side of the mixer 5, the blade edge or blade tip of the mixer 5 is provided. As shown in the figure, a swirl flow is generated in the portion and flows out backward, and the air that flows into the ejector shroud 2 along the outer circumference of the exhaust nozzle 1 is entrained, and the exhaust gas and the air are efficiently mixed.

FIG. 2 is a sectional view of the mixer nozzle according to the present invention embodying the principle shown in FIG. 1 in a stored state, and FIG. 3 is a sectional view of the mixer nozzle in use in relation to FIG. In the figure, the same components as those in FIG. 6 are designated by the same reference numerals.

A lever 4 having a base portion pivotally supported at a predetermined position of the ejector shroud 2 and extending toward the nozzle inner wall 1a near the outlet of the exhaust nozzle 1 is provided. A shape that can be formed in the same plane as the nozzle inner wall 1a by conforming to the cutout portion (see, for example, FIG.
A wing-shaped mixer 5 (shown by a triangle) is rotatably supported on the tip of the lever 4.

Further, in order to tilt the lever 4 so that the mixer 5 can be set to the respective positions of the storage state and the use state, the ejector shroud 2 has a base portion pivotally supported at a predetermined position, and An actuator 6 having a rod tip portion connected to the base portion of the lever 4 is provided, and the lever 4 is formed so that the lever 4 can be tilted by expansion and contraction of the actuator 6.

Further, in order to tilt the mixer 5 so that the elevation angle of the mixer 5 can be adjusted, the mixer 5 has a base portion mounted near the central portion in the length direction of the lever 4 and is connected to a predetermined position of the mixer 5. An actuator 7 having a rod tip portion is provided, and the elevation angle of the mixer 5 can be changed by expanding and contracting the actuator 7.

When the mixer 5 in the storage position as shown in FIG. 2 is moved to the use position as shown in FIG. 3, the actuator 6 is operated in the direction in which the rod extends so that the lever 4 is moved. Push it up and set the mixer 5 in place. Then, the actuator 7 is appropriately expanded and contracted to adjust the elevation angle of the mixer 5 to the optimum state.

When storing the mixer 5 in the in-use position, the actuator 5 is actuated in the direction in which the rod is shortened and the lever 4 is pulled down, whereby the mixer 5 is moved to the nozzle inner wall 1a of the exhaust nozzle 1. Then, the actuator 7 is expanded and contracted to adjust the elevation angle of the mixer 5 to set the mixer 5 so that it is flush with the nozzle inner wall 1a.

According to the above-mentioned structure, the wing-shaped mixer 5 capable of appropriately adjusting the elevation angle is provided on the nozzle inner wall 1a near the outlet of the exhaust nozzle 1. Therefore, when the mixer 5 is set to the use state, When the discharged exhaust gas passes through the vicinity of the mixer 5, a vortex flow is generated at the blade edge and the blade tip of the mixer 5, and flows out rearward, and flows into the ejector shroud 2 along the outer circumference of the exhaust nozzle 1. The air is entrained so that the exhaust gas and the air are efficiently mixed.

FIG. 4 is a sectional view of a mixer nozzle according to another embodiment of the present invention in a stored state showing the outline thereof, and FIG. 5 is a sectional view of a mixer nozzle in use in relation to FIG. 4, which is the same as FIG. Items are given the same reference numerals.

A nozzle outer wall 1b at the outlet end of the exhaust nozzle 1
The pin bracket 8 is provided on the inner surface, and the pin bracket 8
Further, a long lever 9 extending in a direction substantially parallel to the nozzle outer wall 1b and a short lever 10 extending in the central direction of the exhaust nozzle 1 are rotatably mounted by a common pin 11, and the short lever is attached to a tip portion of the long lever 9. A short lever 12 having the same length as that of the lever 10 is rotatably provided by a pin 11 ′ so that it can be formed in the same plane as the nozzle inner wall 1a by accommodating a cutout portion provided in the nozzle inner wall 1a during storage (for example, in FIG. A wing-shaped mixer 5 (triangle shown in FIG. 1) is attached to each tip of the short levers 10 and 12 via pins 13 and 13 ′. Pin 13
And the pin 13 'is spaced from the pin 11 at the end of the long lever 9.
It is desirable that the distance be substantially the same as the distance between the pins 11 '.

Further, a bracket 14 projecting to the nozzle outer wall 1b side is provided at a predetermined position in the middle portion of the long lever 9 in the longitudinal direction, and the tip portion of the bracket 14 and the middle portion of the short lever 10 are connected. The actuator 15 is provided, and the mixer 5 is formed so as to be able to move between the storage position and the use position by expanding and contracting the actuator 15.

Further, a guide 16 extending in the extending direction of the long lever 9 along the nozzle outer wall 1b is provided at a predetermined position on the inner surface of the nozzle outer wall 1b of the exhaust nozzle 1, and a pivot slider which can slide along the guide 16. Guide 17
6 is slidably provided, and further, an actuator 18 is provided which has a base portion fixed to the inner surface of the nozzle outer wall on the extension line of the guide 16 and which connects the rod to the pivot slider 17 and can expand and contract in the direction parallel to the guide 16. .

Then, the pivot slider 17 and the tip of the long lever 9 are connected by a bar 19, and the actuator 18 is expanded and contracted to make the pivot slider 17 extend.
By undulating the long lever 9 through the bar 19 and the bar 19, the elevation angle of the mixer 5 can be adjusted appropriately.

When the mixer 5 in the storage position as shown in FIG. 4 is moved to the use position as shown in FIG. 5, the actuator 15 is operated in the direction in which the rod extends to move the lever 10. Push it up and set the mixer 5 in place. Next, the actuator 18 is expanded / contracted, the pivot slider 17 is appropriately moved along the guide 16, and the long lever 9 is undulated via the bar 19 to adjust the elevation angle of the mixer 5 to an optimum state.

When storing the mixer 5 in the in-use position, the actuator 5 is actuated in the direction in which the rod is shortened and the short lever 10 is pulled down, whereby the mixer 5 is moved to the inner wall of the exhaust nozzle 1. The mixer 5 is set so as to be flush with the nozzle inner wall 1a by returning to the storage position at the same level as 1a and operating the actuator 18 to expand and contract to adjust the elevation angle of the mixer 5.

According to the above-mentioned structure, since the wing-shaped mixer 5 capable of adjusting the elevation angle is provided on the nozzle inner wall 1a near the outlet of the exhaust nozzle 1, when the mixer 5 is set to the use state, When the discharged exhaust gas passes through the vicinity of the mixer 5, a vortex flow is generated at the blade edge and the blade tip of the mixer 5, and flows out rearward, and flows into the ejector shroud 2 along the outer circumference of the exhaust nozzle 1. The air is entrained so that the exhaust gas and the air are efficiently mixed.

In each of the above-mentioned two embodiments, the mixer nozzle in which the mixer is formed in the shape of a triangular blade has been described, but any other shape may be used as long as it is extremely small with respect to the change in the exhaust gas flow direction. It is a matter of course that the wing-shaped mixer does not have to have a structure capable of being housed in the same plane as the inner wall of the nozzle, and other various modifications can be made without departing from the scope of the present invention.

[0031]

According to the mixer nozzle of the present invention, since the blade-shaped mixer is provided near the outlet of the exhaust nozzle, when the exhaust gas discharged from the exhaust nozzle passes by the side of the mixer, the blade edge of the mixer is A vortex flow is generated at the blade portion and the blade tip portion and flows out rearward, and the air that flows into the ejector shroud along the outer circumference of the exhaust nozzle is entrained, and as a result, an excellent effect that the exhaust gas and the air are efficiently mixed can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing the principle of a mixer nozzle of the present invention.

FIG. 2 is a sectional view of a storage state showing an outline of an embodiment of the mixer nozzle of the present invention.

FIG. 3 is a cross-sectional view of a usage state of the mixer nozzle related to FIG.

FIG. 4 is a sectional view of a storage state schematically showing another embodiment of the mixer nozzle of the present invention.

5 is a cross-sectional view of the mixer nozzle in use in relation to FIG. 4. FIG.

FIG. 6 is a cross-sectional view schematically showing an example of an exhaust nozzle of a conventional engine.

7 is a view taken along the line VII-VII in FIG.

[Explanation of symbols]

 1 exhaust nozzle 2 ejector shroud 5 mixer

Claims (1)

[Claims] 1. A mixer nozzle, wherein at least one blade-shaped mixer is provided on an inner surface near an outlet of an exhaust nozzle having an ejector shroud.