Adjustable multi-fuel jet high-altitude ignition device for rotor engine

Abstract

The invention discloses an adjustable multi-fuel jet high-altitude ignition device for a rotor engine. The adjustable multi-fuel jet high-altitude ignition device comprises a jet ignition device, an adjusting device, a rotor engine body, an oil injection system and a control system, one end of the jet ignition device is installed on a cylinder body of the rotor engine body, the other end of the jet ignition device is connected with the adjusting device, and the oil injection system is installed on an air inlet channel of the rotor engine body and the jet ignition device and used for aviation fuel air inlet premixing and gasoline in-cylinder direct injection. The control system is connected with a spark plug of the jet ignition device and the tail end of the oil injection system and controls the adjusting device through the driving motor so as to adjust the deflection angle of a combustion chamber liner of the rotor engine body. According to the active pre-combustion chamber structure of the engine, cylinder pressure at different altitudes is measured through the cylinder pressure sensor, the auxiliary fuel injection amount and the number of the jet flow holes are adjusted, premixed mixed gas in the main combustion chamber is ignited through high-temperature jet flow of the pre-combustion chamber, efficient and sufficient combustion of aviation fuel and gasoline mixed fuel in the low-pressure environment is achieved, and the combustion efficiency is improved. High-altitude power performance of the engine is provided, and emission is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation power, and in particular relates to an adjustable multi-fuel jet high-altitude ignition device for a rotary engine. Background Art

[0002] Compared with traditional engines, rotary engines have a simple and compact structure, smaller size and weight, and fewer parts, which ensures higher reliability of the engine. Secondly, rotary engines have a unique combustion chamber structure, which gives them a higher power density and can produce greater power output in a smaller volume. At present, rotary engines have broad application prospects and are widely used in aviation fields such as drones.

[0003] However, considering the current working conditions of the engine, the air density and temperature are lower in the high-altitude environment, the engine intake flow is less, and the higher fuel equivalence ratio leads to a decrease in the thermal efficiency of engine combustion, which increases fuel costs. At the same time, it is difficult to stop and ignite the engine under high-altitude conditions, which reduces the maneuverability of unmanned aerial vehicle systems. Therefore, the high-altitude ignition technology of the rotary engine needs to be developed.

[0004] In addition, the multi-fuel blending and combustion regulation strategy has significant advantages and shows broad application prospects. Since different fuels have different combustion characteristics and energy densities, through reasonable blending, the combustion process such as combustion speed, temperature and product composition can be regulated, which is beneficial to optimize engine performance, improve combustion efficiency and reduce pollutant emissions. The jet ignition technology does not rely on the pressure and temperature of the external environment. Therefore, under the conditions of thin air at high altitudes and low mixture concentration, it can effectively ignite the gas, accelerate the combustion process, improve combustion efficiency, and increase the output power of the engine. On the whole, on the basis of premixing of aviation kerosene, the use of auxiliary gasoline fuel for jet ignition can effectively solve the problem of high-altitude ignition difficulties, but there is currently little research in this field, and related control technologies are urgently needed to be studied and developed. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the present invention provides an adjustable multi-fuel jet high-altitude ignition device for a rotary engine. The present invention proposes an active pre-combustion chamber structure for the engine, which measures the cylinder pressure at different altitudes through a cylinder pressure sensor, adjusts the auxiliary fuel injection amount and the number of jet holes, and uses the high-temperature jet in the pre-combustion chamber to ignite the premixed mixture in the main combustion chamber, so as to achieve efficient and full combustion of the jet fuel and gasoline mixed fuel in a low-pressure environment, improve the engine's high-altitude power performance, and reduce emissions.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An adjustable multi-fuel jet high-altitude ignition device for a rotary engine, comprising a jet ignition device, a regulating device, a rotary engine body, a fuel injection system and a control system;

[0008] One end of the jet ignition device is installed on the cylinder body of the rotary engine body, and the other end is connected to the regulating device. The injection system is installed on the intake duct of the rotary engine body and the jet ignition device, and is used for aviation kerosene intake premixing and gasoline direct injection into the cylinder; the control system is connected to the spark plug of the jet ignition device and the end of the injection system on the one hand, and controls the regulating device through the drive motor on the other hand, thereby adjusting the deflection angle of the combustion chamber of the rotary engine body.

[0009] A further improvement of the present invention is that the jet ignition device comprises a pre-combustion chamber inner liner, a pre-combustion chamber outer shell, a spark plug, an inner jet hole, an outer jet hole, a fuel channel and a connecting seat;

[0010] The pre-combustion chamber shell is integrally processed with the cylinder body of the rotary engine body, the pre-combustion chamber inner shell is coaxially installed in the pre-combustion chamber shell, the pre-combustion chamber inner shell is processed with inner jet holes, and the pre-combustion chamber shell is processed with outer jet holes; the top of the pre-combustion chamber inner shell is processed with threads to connect with the spark plug; a fuel channel is arranged at one end of the pre-combustion chamber inner shell, and a connecting seat is processed with the top and outer side of the fuel channel.

[0011] A further improvement of the present invention is that the pre-combustion chamber shell is processed with a groove and equipped with a sealing ring to prevent gas leakage through the gap between the pre-combustion chamber inner liner and the pre-combustion chamber shell due to internal high pressure.

[0012] A further improvement of the present invention is that the number of the external jet holes is 5: one central jet hole is arranged perpendicular to the combustion chamber; and four circumferential jet holes are arranged evenly distributed circumferentially, with a processing angle of 45°.

[0013] A further improvement of the present invention is that the number of jet holes is 7: 1 central jet hole is arranged perpendicular to the combustion chamber; 6 circumferential jet holes, 4 of which are arranged at angles corresponding to the outer jet holes, and the remaining 2 are arranged diagonally with a horizontal deflection of 30°.

[0014] A further improvement of the present invention is that the adjustment device includes a driving shaft, a key, a rotating disk, a connecting rod, an adjusting rod, a connecting pin and a fixing pin;

[0015] The driving shaft is connected to the turntable through a key, the turntable is connected to one end of the connecting rod through a connecting pin and a fixing pin, the connecting rod and the adjusting rod are respectively processed with internal and external threads, and the other end of the connecting rod is connected to the pre-combustion chamber liner; when the driving shaft rotates, the turntable rotates accordingly, and drives the pre-combustion chamber liner to rotate through the connecting rod and the adjusting rod, so that it cooperates with the pre-combustion chamber outer shell.

[0016] A further improvement of the present invention is that the rotary engine body comprises a cylinder block, a rotor, an eccentric shaft, an intake passage and a combustion chamber;

[0017] The tip of the cylinder body and the side of the rotor are in sliding line contact, and the rotor and the eccentric shaft are connected by bearings to achieve coaxial operation; the rotor divides the internal space of the cylinder body into three combustion chambers, and the tail of the intake duct corresponds to the inner cavity of the rotor; the fresh gas and jet fuel mixture enters the combustion chamber through the inside of the rotor, and after being ignited by the built-in jet ignition device, it expands and does work, driving the crankshaft to rotate and do work.

[0018] A further improvement of the present invention is that the fuel injection system includes a carburetor, a throttle valve, a gasoline nozzle, a needle valve, a fuel injection hole, an adjustment knob, a fixing nut, an adjustment spring and an oil circuit;

[0019] The carburetor is installed in the middle of the intake duct, and jet fuel is sprayed into the intake pipe through self-priming; one end of the throttle valve is installed in the carburetor; the gasoline nozzle is connected to the pre-combustion chamber inner liner by bolts, and the gasoline enters through the oil circuit and lifts the needle valve, and sprays into the fuel channel from the injection hole. After the fuel pressure drops, the needle valve closes under the action of the adjusting spring, and the injection ends; the top of the gasoline nozzle is connected to the adjusting knob by a thread, and the top of the adjusting knob is equipped with a fixing nut, which can stably control the adjusting spring pressure.

[0020] A further improvement of the present invention is that the control system includes a cylinder pressure sensor, a monitoring system and a drive motor;

[0021] The other end of the throttle valve is connected to the drive motor. The cylinder pressure sensor is arranged on the cylinder body and connected to the cylinder body through threads. The tail is connected to the monitoring system through a signal line. One end of the drive motor is connected to the monitoring system, and the other end is connected to the ignition device adjustment device and the fuel injection system.

[0022] A further improvement of the present invention is that the monitoring system is used to control the drive motor after processing the cylinder pressure data, drive the regulating device and the fuel injection system, and control the engine jet ignition and fuel injection.

[0023] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0024] The present invention provides an adjustable multi-fuel jet high-altitude ignition device for a rotary engine. A jet pre-combustion chamber is provided for the rotary engine combustion chamber structure. The spark plug is arranged in the pre-combustion chamber for ignition, generating a high-pressure and high-temperature flame in a narrow space, entering the main combustion chamber through the jet hole, generating a jet flame, and igniting the mixed gas in the combustion chamber. The high-energy flame replaces the traditional spark plug arranged in the main combustion chamber, has higher ignition energy, makes combustion more complete, and expands the combustion boundary to improve high-altitude performance.

[0025] The adjustable ignition device of the present invention controls the rotation of the drive shaft by the control system, drives the inner liner of the pre-combustion chamber to rotate through the adjustment rod, and cooperates with the outer shell of the pre-combustion chamber according to different phases to change the number of jet holes under different working conditions, adjust the number of jet flames and the flame penetration distance, improve the ignition boundary of the engine in the high-altitude environment, and improve the combustion stability.

[0026] The fuel nozzles of the present invention are arranged in the air intake duct and the pre-combustion chamber respectively, realizing a dual injection structure of aviation kerosene intake premixing and gasoline direct injection in the cylinder. Through the dual injection design, the advantages of aviation kerosene high-altitude combustion stability and gasoline easy ignition are combined. At the same time, the direct injection of gasoline in the cylinder increases the rotary engine's ability to regulate the combustion process, which is conducive to stratified combustion and improves the engine's combustion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a system schematic diagram of an adjustable multi-fuel jet high-altitude ignition device in an embodiment of the present invention.

[0028] Figure 2 It is a schematic diagram of the three-dimensional structure of the adjustable multi-fuel jet high-altitude ignition device in an embodiment of the present invention.

[0029] Figure 3 Schematic diagram of the pre-combustion chamber structure in an embodiment of the present invention.

[0030] Figure 4 Schematic diagram of the arrangement and coordination of the jet holes in the embodiment of the present invention, wherein Figure 4 (a) is the working state of the 5-hole jet. Figure 4 (b) is the working state of the 3-hole jet. Figure 4 (c) is the working state of single-hole jet.

[0031] Figure 5 It is a schematic diagram of the regulating mechanism of the jet ignition device in the embodiment of the present invention.

[0032] Figure 6 It is a schematic diagram of the main components of the rotary engine in an embodiment of the present invention.

[0033] Figure 7 Schematic diagram of the fuel injection system in an embodiment of the present invention.

[0034] Figure 8 Schematic diagram of the jet ignition regulation principle in the embodiment of the present invention, wherein Figure 8 (a) Spark plug ignition, initial fire core formation stage; Figure 8 (b) The flame expansion stage in the pre-combustion chamber; Figure 8 (c) is the stage where the flame passes through the jet hole to form multiple jets. Figure 8 (d) is the expansion stage of the jet flame in the main combustion chamber.

[0035] Fig. 9 The figure shows the cylinder pressure comparison of the rotary engine when the jet ignition and the ordinary spark plug ignition are respectively adopted in the embodiment of the present invention.

[0036] Description of reference numerals:

[0037] 1 is a jet ignition device, 1-1 is a pre-combustion chamber inner shell, 1-2 is a pre-combustion chamber outer shell, 1-3 is a spark plug, 1-4 is a sealing ring, 1-5 is an inner jet hole, 1-6 is an outer jet hole, 1-7 is a fuel channel, and 1-8 is a connecting seat;

[0038] 2 is an adjusting device, 2-1 is a driving shaft, 2-2 is a key, 2-3 is a turntable, 2-4 is a connecting rod, 2-5 is an adjusting rod, 2-6 is a connecting pin, and 2-7 is a fixing pin;

[0039] 3 is the body of the rotary engine, 3-1 is the cylinder block, 3-2 is the rotor, 3-3 is the eccentric shaft, 3-4 is the intake duct, and 3-5 is the combustion chamber;

[0040] 4 is the fuel injection system, 4-1 is the carburetor, 4-2 is the throttle valve, 4-3 is the gasoline nozzle, 4-4 is the needle valve, 4-5 is the fuel injection hole, 4-6 is the adjustment knob, 4-7 is the fixing nut, 4-8 is the adjustment spring, and 4-9 is the oil circuit;

[0041] 5 is a control system, 5-1 is a cylinder pressure sensor, 5-2 is a monitoring system, and 5-3 is a drive motor. DETAILED DESCRIPTION

[0042] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0045] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0047] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0048] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0049] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0050] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0051] Example 1

[0052] like Figure 1 , 2 As shown, the present invention provides an adjustable multi-fuel jet high-altitude ignition device for a rotary engine, comprising a jet ignition device 1, an adjustment device 2, a rotary engine body 3, an injection system 4 and a control system 5. Among them, one end of the jet ignition device 1 is installed on the cylinder body 3-1, and the other end is connected to the adjustment device 2. The injection system 4 is installed at both the intake duct 3-4 and the jet ignition device 1, so as to achieve the purpose of premixing the intake of aviation kerosene and direct injection of gasoline in the cylinder. The control system 5 is connected to the ends of the spark plug 1-3 and the injection system 4 on the one hand, and controls the adjustment device 2 through the drive motor 5-3 on the other hand, thereby adjusting the deflection angle of the inner liner of the combustion chamber 3-5.

[0053] like Figure 2 , 3 As shown, in this embodiment, the jet ignition device 1 comprises a pre-combustion chamber inner liner 1-1, a pre-combustion chamber outer shell 1-2, a spark plug 1-3, a sealing ring 1-4, an inner jet hole 1-5, an outer jet hole 1-6, a fuel channel 1-7 and a connecting seat 1-8; the pre-combustion chamber outer shell 1-2 is integrated with the cylinder body 3-1 of the rotary engine body 3, the pre-combustion chamber inner liner 1-1 is coaxially installed in the pre-combustion chamber outer shell 1-2, the pre-combustion chamber inner liner 1-1 is processed with an inner jet hole 1-5, and the pre-combustion chamber outer shell 1-2 is processed with an outer jet hole 1-6. In addition, the pre-combustion chamber outer shell 1-2 is processed with a groove and equipped with a sealing ring 1-4 to prevent gas leakage through the gap between the pre-combustion chamber inner liner 1-1 and the pre-combustion chamber outer shell 1-2 due to internal high pressure. The top of the pre-combustion chamber inner shell 1-1 is processed with threads and connected to the spark plug 1-3; a fuel channel 1-7 is arranged at one end of the pre-combustion chamber inner shell 1-1, and a connecting seat 1-8 is processed at the top and outside of the fuel channel 1-7.

[0054] like Figure 3 , 4As shown, in this embodiment, the jet holes are composed of two parts, the inner jet holes 1-5 and the outer jet holes 1-6, which are arranged on the pre-combustion chamber inner liner 1-1 and the pre-combustion chamber outer shell 1-2 respectively. Among them, the number of outer jet holes 1-6 is 5: 1 central jet hole is arranged perpendicular to the combustion chamber 3-5; 4 circumferential jet holes are arranged, evenly distributed circumferentially, and the processing angle is 45°. The number of inner jet holes 1-5 is 7: 1 central jet hole is arranged perpendicular to the combustion chamber 3-5; 6 circumferential jet holes, 4 of which are arranged at angles corresponding to the outer jet holes 1-6, and the remaining 2 are arranged diagonally with a horizontal deflection of 30°. When the jet ignition device 1 is in working state 1, all the outer jet holes 1-6 are connected, and the high-temperature combustion gas enters the combustion chamber 3-5 through 5 jet holes; in working state 2, the pre-combustion chamber inner liner 1-1 is deflected 30° counterclockwise, and only the central and horizontal outer jet holes 1-6 are connected circumferentially, and the jet ignition device 1 is adjusted to a three-hole jet; in working state 3, the pre-combustion chamber inner liner 1-1 is deflected 60° counterclockwise, and only the central outer jet hole 1-6 is connected to the pre-combustion chamber liner 1-1, and the jet ignition device 1 is adjusted to a single-hole jet.

[0055] like Figure 2 , 5 As shown, in this embodiment, the adjusting device 2 includes a driving shaft 2-1, a key 2-2, a turntable 2-3, a connecting rod 2-4, an adjusting rod 2-5, a connecting pin 2-6 and a fixing pin 2-7. Among them, the driving shaft 2-1 is connected to the turntable 2-3 through the key 2-2, and the turntable 2-3 is connected to one end of the connecting rod 2-4 through the connecting pin 2-6 and the fixing pin 2-7. The connecting rod 2-4 and the adjusting rod 2-5 are respectively processed with internal and external threads, which can calibrate and control the adjustment length. The other end of the connecting rod 2-4 is connected to the pre-combustion chamber liner 1-1. When the driving shaft 2-1 rotates, the turntable 2-3 rotates accordingly, and drives the pre-combustion chamber liner 1-1 to rotate through the connecting rod 2-4 and the adjusting rod 2-5, so that it cooperates with the pre-combustion chamber shell 1-2 to achieve the adjustment of the number of jet holes.

[0056] like Figure 6As shown, in this embodiment, the rotor engine body 3 includes a cylinder 3-1, a rotor 3-2, an eccentric shaft 3-3, an intake duct 3-4 and a combustion chamber 3-5. From a structural point of view, the tip of the cylinder 3-1 is in slidable line contact with the side of the rotor 3-2, and the rotor 3-2 and the eccentric shaft 3-3 are connected by bearings to achieve coaxial operation. Therefore, the rotor 3-2 divides the internal space of the cylinder 3-1 into three combustion chambers 3-5, and the middle section of the intake duct 3-4 is equipped with a carburetor 4-1 and a throttle valve 4-2, and the tail corresponds to the inner cavity of the rotor 3-2. The fresh gas and the jet fuel mixture enter the combustion chamber 3-5 through the inside of the rotor 3-2, and after being ignited by the built-in jet ignition device 1, it expands and does work, driving the eccentric shaft to rotate and do work. In order to cope with the heat load caused by the high-temperature combustion in the pre-combustion chamber, the corresponding position of the cylinder 3-1 should be densely arranged with heat sinks. In order to realize the in-cylinder working condition detection, a hole should be opened on one side of the cylinder 3-1 for arranging the cylinder pressure sensor 5-1.

[0057] like Figure 3 , 6 As shown in Figures 7 and 8, in this embodiment, the fuel injection system 4 includes a carburetor 4-1, a throttle valve 4-2, a gasoline nozzle 4-3, a needle valve 4-4, a fuel injection hole 4-5, an adjusting knob 4-6, a fixing nut 4-7, an adjusting spring 4-8 and an oil circuit 4-9. The carburetor 4-1 is installed in the middle of the intake passage 3-4, and the jet fuel is sprayed into the intake pipe by self-priming. One end of the throttle valve 4-2 is installed in the carburetor 4-1, and the other end is connected to the drive motor 5-3. The opening of the paddle is controlled by mechanical transmission to adjust the amount of jet fuel inhaled. The gasoline nozzle 4-3 is connected to the pre-combustion chamber 1-1 by bolts. After the gasoline enters through the oil circuit 4-9, the needle valve 4-4 is lifted up and sprayed into the fuel channel 1-7 from the fuel injection hole 4-5. After the fuel pressure drops, the needle valve 4-4 is closed under the action of the adjusting spring 4-8, and the fuel injection ends. The top of the gasoline nozzle 4-3 is connected to the adjusting knob 4-6 through a thread, and a fixing nut 4-7 is arranged above the adjusting knob 4-6 to stably control the pressure of the adjusting spring 4-8.

[0058] like Figure 1 , 2 As shown, in this embodiment, the control system 5 includes a cylinder pressure sensor 5-1, a monitoring system 5-2 and a drive motor. The cylinder pressure sensor 5-1 is arranged on the cylinder body 3-1, connected to the cylinder body 3-1 by threads, and the tail is connected to the monitoring system 5-2 by a signal line. One end of the drive motor 5-3 is connected to the monitoring system 5-2, and the other end is connected to the ignition device adjustment device 2 and the injection system 4. The monitoring system 5-2 is used to control the drive motor 5-3 after processing the cylinder pressure data, drive the adjustment device 2 and the injection system 4, and control the engine jet ignition and fuel injection.

[0059] Example 2

[0060] When in use, the rotary engine body 3 is fixed, the sealing ring 1-4 and the jet igniter liner are installed, the initial position of the igniter liner is the 5-hole jet working state, the cylinder pressure sensor 5-1 is connected to the cylinder body 3-1 through threads, about 5mm away from the inner wall of the combustion chamber 3-5. The carburetor 4-1 is installed in the middle section of the intake duct 3-4 through bolts, the gasoline nozzle 4-3 is matched with the connecting seat 1-8 through bolts, the injection direction and the vertical direction are at an angle of 30°, and the spark plug 1-3 is installed vertically above the pre-combustion chamber liner 1-1 through threads, 20mm away from the bottom. The connecting rod 2-4 is matched with the pre-combustion chamber inner liner 1-1 through the connecting pin 2-6 and the fixing pin 2-7. The connection should leave more than 60° of rotation space to achieve vertical fixation and circumferential rotation. The connecting rod 2-4 on the other side is connected to the turntable 2-3 in the same way. The connecting rods 2-4 on both sides are processed with internal threads. The middle is connected by the adjustment rod 2-5, and 5-10mm of residual length is left to control the calibration length and adjust the torque. The driving shaft 2-1 is matched with the turntable 2-3 through the key 2-2, and the bottom is connected to the driving motor 5-3 through mechanical transmission. The control system 5 is arranged on the front upper part of the rotor engine body 3, connected to the sensor, and connected to the driving motor 5-3 on the other side. The tail end of the driving motor 5-3 is connected to the throttle valve 4-2, the gasoline nozzle 4-3, and the driving shaft 2-1.

[0061] When the control system 5 is working, when the engine operating altitude increases and ignition becomes difficult, the cylinder pressure sensor 5-1 detects the pressure in the cylinder and converts the force into an electrical signal, which is transmitted to the monitoring system 5-2 through a signal line. The monitoring system 5-2 processes the data and issues adjustment instructions to control the drive motor 5-3. The drive motor 5-3 controls the opening of the throttle valve 4-2, the pressure of the gasoline nozzle 4-3, and the phase of the drive shaft 2-1.

[0062] When the adjusting device 2 is working, the rotational torque of the driving shaft 2-1 is transmitted to the pre-combustion chamber 1-1 through the connecting rod 2-4 and the adjusting rod 2-5, and the pre-combustion chamber 1-1 rotates accordingly. At the working phases of 0°, 30°, and 60°, 5 holes, 3 holes, and 1 hole are connected with the pre-combustion chamber shell 1-2, respectively, to achieve the working states of 5-hole jet, 3-hole jet, and single-hole jet.

[0063] In the jet ignition device 1, in order to prevent the high-pressure gas in the precombustion chamber from leaking through the gap between the precombustion chamber inner liner 1-1 and the precombustion chamber outer shell 1-2 and ensure air tightness, the precombustion chamber outer shell 1-2 should be processed with grooves and equipped with a sealing ring 1-4.

[0064] The regulating device 2 is subjected to a small load. In order to reduce the weight of the engine, improve the power-to-weight ratio, and ensure the stability of high-altitude operation, the regulating device 2 is preferably made of lightweight materials to reduce the weight of the components.

[0065] Since the working temperature of the jet ignition device 1 is high, the pre-combustion chamber 1-1 and the cylinder body 3-1 should be made of high temperature resistant materials. At the same time, the heat sinks on the outer side of the cylinder body 3-1 should be densely arranged to reduce the heat load of the components.

[0066] See also Figure 8 , Schematic diagram of the jet ignition regulation principle under the 5-hole jet state, the flame is sprayed into the combustion chamber 3-5 through the jet hole, forming multiple jet flames to ignite the mixture, the ignition energy is higher, and the combustion is more complete.

[0067] See also Fig. 9 , Comparison of cylinder pressure of rotary engine when using 5-hole jet ignition and ordinary spark plug ignition. As can be seen from the figure, the cylinder pressure of the engine using jet ignition rises more rapidly and the peak pressure is higher.

[0068] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art can still modify or make equivalent substitutions to the specific implementations of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention are within the scope of protection of the claims of the present invention.

Claims

1. An adjustable multi-fuel jet high-altitude ignition device for a rotary engine, characterized in that: It includes a jet ignition device, a regulating device, a rotary engine body, a fuel injection system and a control system; One end of the jet ignition device is installed on the cylinder body of the rotary engine body, and the other end is connected to the regulating device. The injection system is installed on the intake duct of the rotary engine body and the jet ignition device, and is used for aviation kerosene intake premixing and gasoline direct injection into the cylinder; the control system is connected to the spark plug of the jet ignition device and the end of the injection system on the one hand, and controls the regulating device through the drive motor on the other hand, thereby adjusting the deflection angle of the combustion chamber of the rotary engine body.

2. The adjustable multi-fuel jet high-altitude ignition device for a rotary engine according to claim 1, characterized in that: The jet ignition device comprises a pre-combustion chamber inner liner, a pre-combustion chamber outer shell, a spark plug, an inner jet hole, an outer jet hole, a fuel channel and a connecting seat; The pre-combustion chamber shell is integrally processed with the cylinder body of the rotary engine body, the pre-combustion chamber inner shell is coaxially installed in the pre-combustion chamber shell, the pre-combustion chamber inner shell is processed with inner jet holes, and the pre-combustion chamber shell is processed with outer jet holes; the top of the pre-combustion chamber inner shell is processed with threads to connect with the spark plug; a fuel channel is arranged at one end of the pre-combustion chamber inner shell, and a connecting seat is processed with the top and outer side of the fuel channel.

3. The adjustable multi-fuel jet high-altitude ignition device for a rotary engine according to claim 2, characterized in that: The pre-combustion chamber shell is processed with grooves and equipped with a sealing ring to prevent gas from leaking through the gap between the pre-combustion chamber inner liner and the pre-combustion chamber shell due to internal high pressure.

4. The adjustable multi-fuel jet high-altitude ignition device for a rotary engine according to claim 2, characterized in that: There are 5 external jet holes: 1 central jet hole is arranged perpendicular to the combustion chamber; 4 circumferential jet holes are arranged evenly distributed circumferentially, and the processing angle is 45°.

5. The adjustable multi-fuel jet high-altitude ignition device for a rotary engine according to claim 2, characterized in that: The number of jet holes is 7: one central jet hole is arranged perpendicular to the combustion chamber; There are 6 circumferential jet holes, 4 of which are arranged at angles corresponding to the outer jet holes, and the remaining 2 are arranged along the diagonal line with a horizontal deflection of 30°.

6. The adjustable multi-fuel jet high-altitude ignition device for a rotary engine according to claim 2, characterized in that: The adjusting device comprises a driving shaft, a key, a rotating disk, a connecting rod, an adjusting rod, a connecting pin and a fixing pin; The driving shaft is connected to the turntable through a key, the turntable is connected to one end of the connecting rod through a connecting pin and a fixing pin, the connecting rod and the adjusting rod are respectively processed with internal and external threads, and the other end of the connecting rod is connected to the pre-combustion chamber liner; when the driving shaft rotates, the turntable rotates accordingly, and drives the pre-combustion chamber liner to rotate through the connecting rod and the adjusting rod, so that it cooperates with the pre-combustion chamber outer shell.

7. The adjustable multi-fuel jet high-altitude ignition device for a rotary engine according to claim 6, characterized in that: The rotary engine body includes a cylinder block, a rotor, an eccentric shaft, an intake duct and a combustion chamber; The tip of the cylinder body and the side of the rotor are in sliding line contact, and the rotor and the eccentric shaft are connected by bearings to achieve coaxial operation; the rotor divides the internal space of the cylinder body into three combustion chambers, and the tail of the intake duct corresponds to the inner cavity of the rotor; the fresh gas and jet fuel mixture enters the combustion chamber through the inside of the rotor, and after being ignited by the built-in jet ignition device, it expands and does work, driving the crankshaft to rotate and do work.

8. The adjustable multi-fuel jet high-altitude ignition device for a rotary engine according to claim 7, characterized in that: The fuel injection system includes a carburetor, a throttle valve, a gasoline nozzle, a needle valve, a fuel injection hole, an adjustment knob, a fixing nut, an adjustment spring and an oil circuit; The carburetor is installed in the middle of the intake duct, and jet fuel is sprayed into the intake pipe through self-priming; one end of the throttle valve is installed in the carburetor; the gasoline nozzle is connected to the pre-combustion chamber inner liner by bolts, and the gasoline enters through the oil circuit and lifts the needle valve, and sprays into the fuel channel from the injection hole. After the fuel pressure drops, the needle valve closes under the action of the adjusting spring, and the injection ends; the top of the gasoline nozzle is connected to the adjusting knob by a thread, and the top of the adjusting knob is equipped with a fixing nut, which can stably control the adjusting spring pressure.

9. The adjustable multi-fuel jet high-altitude ignition device for a rotary engine according to claim 8, characterized in that: The control system includes a cylinder pressure sensor, a monitoring system and a drive motor; The other end of the throttle valve is connected to the drive motor. The cylinder pressure sensor is arranged on the cylinder body and connected to the cylinder body through threads. The tail is connected to the monitoring system through a signal line. One end of the drive motor is connected to the monitoring system, and the other end is connected to the ignition device adjustment device and the fuel injection system.

10. The adjustable multi-fuel jet high-altitude ignition device for a rotary engine according to claim 9, characterized in that: The monitoring system is used to process the cylinder pressure data, control the drive motor, drive the regulating device and the injection system, and control the engine jet ignition and fuel injection.

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