Liquid-gas counterflow arrangement structure of methanol engine nozzle

Abstract

The utility model discloses a kind of methanol engine nozzle gas-liquid convection arrangement structures, including methanol nozzle, methanol nozzle is installed in air inlet pipe, the jet direction of the outlet end of methanol nozzle is opposite tangential to airflow direction.The utility model of a kind of methanol engine nozzle gas-liquid convection arrangement structures, using non-parallel injection layout, methanol nozzle jet direction and airflow direction are arranged oppositely with obtuse angle, make methanol spray main beam and air intake airflow form head-on, strengthen gas-liquid convection shear action, improve methanol vaporization efficiency.

Description

Technical Field

[0001] This utility model relates to the field of internal combustion engine injection technology, and in particular to a gas-liquid convection arrangement structure for a methanol engine nozzle. Background Technology

[0002] A methanol engine is an internal combustion engine that uses methanol as its primary fuel. The traditional design of the fuel supply system injection structure in a methanol engine is that the centerline (injection direction) of the methanol nozzle outlet is horizontal with the direction of the airflow tangential. (See [link to relevant documentation]). Figure 1 Methanol droplets are ejected forward by the airflow and diffuse by their own kinetic energy. The vaporization time is insufficient, resulting in low vaporization efficiency. Utility Model Content

[0003] The purpose of this invention is to address the above-mentioned problems by providing a methanol engine nozzle gas-liquid convection arrangement structure, which can enhance the gas-liquid convection shearing effect and improve the methanol vaporization efficiency.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A methanol engine nozzle gas-liquid convection arrangement structure includes a methanol nozzle, which is installed in the intake pipe, and the spray direction of the outlet end of the methanol nozzle is opposite to the tangent of the airflow direction.

[0005] Specifically, the injection direction at the outlet end of the methanol nozzle forms an obtuse angle with the tangent of the airflow direction. More precisely, the injection direction at the outlet end of the methanol nozzle forms an angle of 135°-150° with the tangent of the airflow direction.

[0006] The methanol nozzle has a straight cylindrical structure, and its internal channel remains straight from the inlet to the outlet. Therefore, a rearward (relative to the airflow direction) mounting port is opened in the air inlet pipe to install the straight cylindrical methanol nozzle.

[0007] By adopting the above technical solution, this utility model has the following beneficial effects: This invention relates to a methanol engine nozzle gas-liquid convection arrangement structure, which adopts a non-parallel injection layout. The methanol nozzle injection direction is arranged at an obtuse angle to the airflow direction, so that the main stream of methanol spray and the intake airflow form a countercurrent, which enhances the gas-liquid convection shearing effect and improves the methanol vaporization efficiency. Attached Figure Description

[0008] Figure 1 This is a traditional layout diagram of the nozzles for a methanol engine.

[0009] Figure 2 This is a layout diagram of Example 1 of the methanol engine nozzle of this utility model.

[0010] Figure 3 This is a layout diagram of Example 2 of the methanol engine nozzle of this utility model.

[0011] In the attached diagram, 1 is the air intake pipe, and 2 is the methanol nozzle. Detailed Implementation Example 1

[0012] See Figure 2 The methanol engine nozzle gas-liquid convection arrangement structure of this embodiment 1 includes a methanol nozzle 2, which is installed on the intake pipe 1, and the spray direction of the outlet end of the methanol nozzle 2 is opposite to the tangent of the airflow direction.

[0013] Specifically, the injection direction at the outlet end of the methanol nozzle 2 forms an obtuse angle with the tangent of the airflow direction. More specifically, the injection direction at the outlet end of the methanol nozzle forms an angle of 135°-150° with the tangent of the airflow direction, such as 140° or 145°.

[0014] like Figure 2 As shown, the methanol nozzle can adopt a curved structure of curved outlet section 21, which can be a circular arc bend or an elliptical arc bend, etc., without changing the layout of the air inlet pipe installation port. Example 2

[0015] This embodiment 2 and embodiment 1 both use a straight-tube nozzle and its mounting port layout.

[0016] See Figure 3 The methanol engine nozzle gas-liquid convection arrangement structure of this embodiment 2 includes a methanol nozzle 2, which is installed on the intake pipe 1, and the spray direction of the outlet end of the methanol nozzle 2 is opposite to the tangent of the airflow direction.

[0017] Specifically, the injection direction at the outlet end of the methanol nozzle 2 forms an obtuse angle with the tangent of the airflow direction. For instance, the injection direction at the outlet end of the methanol nozzle forms an angle of 135°-150° with the tangent of the airflow direction, such as 142°.

[0018] The methanol nozzle has a straight-cylinder structure, with its internal channel maintaining a straight line from inlet to outlet. Therefore, a rearward (relative to the airflow direction) mounting port is opened in the intake pipe to install the straight-cylinder methanol nozzle. Based on this, tests were conducted at a relative velocity of 68 m / s between the intake airflow and the droplets at 38°: When the angle between the injection direction and the airflow direction is greater than 150°, the methanol droplets have an excessively long penetration distance, impacting the opposite cylinder wall, resulting in a wetted wall ratio greater than 15%. When the angle between the injection direction and the airflow direction is equal to 142°, the droplets are fully broken up and diffused uniformly, with a wetted wall ratio of less than 5%. When the angle between the injection direction and the airflow direction is less than 135°, the spray diffuses prematurely, the mixing capacity decreases, and localized over-concentration zones increase.

[0019] As mentioned above, this invention is applicable to the fuel supply system of methanol engines. Through innovative nozzle spatial layout and coordinated intake airflow dynamics, it addresses the core problem of low methanol vaporization efficiency. A non-parallel injection layout with an axial tilt design places the methanol nozzle's injection direction at an obtuse angle to the airflow direction, causing the main methanol spray stream to oppose the intake airflow and enhancing gas-liquid convection shearing. When the methanol spray is injected at a 38° angle against the intake airflow, the droplets form a high-speed shear layer with the high-speed airflow (>50 m / s), resulting in severe droplet surface abrasion: the SMD (Small Diameter) of the droplets decreases from 50 μm to 22 μm, and the specific surface area increases by 127%; turbulent kinetic energy increases by 40%, breaking down the vapor barrier on the droplet surface and doubling the vaporization rate.

[0020] It should be noted that the examples of the above embodiments can preferably be combined with one or more of each other according to actual needs, and the accompanying drawings of multiple examples adopt a set of combined technical features, which will not be described in detail here.

[0021] It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation.

[0022] The above description is a detailed explanation and illustration of the preferred embodiments of the present utility model. However, these descriptions are not intended to limit the scope of protection claimed by the present utility model. All equivalent changes or modifications made under the technical teachings of the present utility model shall fall within the patent protection scope covered by the present utility model.

Claims

1. A methanol engine nozzle gas-liquid convection arrangement structure, comprising a methanol nozzle, wherein the methanol nozzle is installed in the intake pipe, characterized in that: The injection direction at the outlet end of the methanol nozzle is tangential to the airflow direction.

2. The methanol engine nozzle gas-liquid convection arrangement structure according to claim 1, characterized in that: The injection direction at the outlet end of the methanol nozzle forms an obtuse angle with the tangent of the airflow direction.

3. The methanol engine nozzle gas-liquid convection arrangement structure according to claim 2, characterized in that: The spray direction at the outlet end of the methanol nozzle forms an angle of 135°-150° with the tangent of the airflow direction.

4. The gas-liquid convection arrangement structure of a methanol engine nozzle according to claim 3, characterized in that: The methanol nozzle's outlet direction forms a 142° angle with the tangent of the airflow direction.

5. The gas-liquid convection arrangement structure of a methanol engine nozzle according to claim 1, characterized in that: The methanol nozzle has a straight cylindrical structure.

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