CN101975123A - Knocking pipe with central cone of pulse knocking engine - Google Patents
Knocking pipe with central cone of pulse knocking engine Download PDFInfo
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- CN101975123A CN101975123A CN201010534660XA CN201010534660A CN101975123A CN 101975123 A CN101975123 A CN 101975123A CN 201010534660X A CN201010534660X A CN 201010534660XA CN 201010534660 A CN201010534660 A CN 201010534660A CN 101975123 A CN101975123 A CN 101975123A
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Abstract
The invention provides a knocking pipe with a central cone of a pulse knocking engine. In the invention, the middle section of the knocking pipe is provided with a central cone which is a conical structure, and the central cone is fixedly connected with the knocking pipe through a second oxidant conduit and a second fuel conduit; the central axis of the central cone is collinear with the central axis of the knocking pipe; the bottom surface diameter of the central cone is smaller than the inner diameter of the knocking pipe; by arranging the central cone inside the knocking pipe, the interior of an ignition section between the central cone and the knocking pipe is similar to a cavity of which two ends are not closed; and the ignition section is equivalent to that a small-energy source is used for igniting a small quantity of combustible mixtures, and after the ignition energy is amplified, a combustible mixture of the main knocking pipe body is ignited. Because the temperature and the pressure of a combustion product, which are propagated by the ignition section are higher, a combustible mixture in a knocking forming section can be quickly ignited, and knocking waves can be quickly formed, therefore, the distance from deflagrating to knocking is shortened, the filling condition of liquid fuels is improved, the oil consumption rate is reduced, and the engine performance is improved.
Description
Technical field
The present invention relates to engine art, be specially a kind of detonation tube that has the pulse-knocking engine of conical inner body.
Background technique
Pulse-knocking engine is a kind of astable new concept engine that utilizes intermittent type or pulsed detonation wave to produce thrust.Detonation wave is propagated in combustible gas with the speed of about 2000 meters of per seconds, can produce high pressure ratio (15-55 doubly) and fuel gas temperature (greater than 2800K).When high temperature, high pressure, high-speed fuel gas will produce thrust when pulse-knocking engine is discharged.Because detonation wave propagation speed is exceedingly fast, combustion process thereafter is near the isochoric combustion process.The efficiency of cycle is than the high 18%-20% of traditional rocket motor; Do not need complicated turbine pump, simple in structure, in light weight; The unit of fuel consumption rate is low; Thrust regulation is than big, and response is fast, and adjustment process is simple and reliable; Operating range is wide.Use free incoming flow or airborne oxygenant, can work with airbreathing motor or rocket motor mode respectively.The rocket type pulse-knocking engine is owing to carry oxygenant, and working environment is easy to control, it is generally acknowledged that its practical application meeting has precedence over air-breathing pulse detonation engine.
The formation of the detonation wave of pulse-knocking engine inside generally has dual mode: a kind of is to adopt low-yield igniting, produces detonation wave by detonation to the pinking transition process then, and this is indirect method of initiation; Another kind is to adopt high-energy ignition, and at very short time and the interior direct formation detonation wave of distance, this mode is also referred to as the direct initiation method.The ignition energy that the direct initiation method needs is very big, and ignition mechanism is complicated and heavy, and this can cause the structure of motor more complicated, weight increases, decreased performance.The direct initiation method is unrealistic in the motor practicality, so often adopts the method for detonating indirectly to produce detonation wave in the practicality, and adopts enhancing pinking device such as Shchelkin spiral, orifice plate etc.Because detonation needs regular hour and distance to the pinking transition process, transition distance is often very long, and this just causes the length of pulse-knocking engine and the ratio of cross-sectional diameter (abbreviation slenderness ratio) bigger.
Consider the restriction of engine capacity, often adopt liquid fuel in actual applications.Because the non-permanent characteristic of pulse-knocking engine, filling time when it is worked under high frequency condition in each circulation is very short, and the slenderness ratio of motor is bigger, the bulk range of liquid fuel will be much smaller than the length of motor, this is the front end enrichment with regard to causing liquid fuel in the distribution of engine interior, the rear end deficiency, and this perfect combustion to ignition mixture is disadvantageous, cause the oil consumption rate of motor high, can influence the raising of pulse-knocking engine performance.Because the increase of motor length can bring fuel filling time and period of exhaust to increase, increase single cycle time in addition, so the raising of engine operation frequency is restricted, it is disadvantageous that engine long is spent long raising for frequency.Therefore, the length that shortens the pulse-knocking engine that adopts liquid fuel is highly significant in actual applications, this will directly improve the occupid state of engine interior ignition mixture, improve the combustion characteristic of motor, reduce fuel consumption rate, improve the engine operation upper frequency limit, given play to the theoretical advantage of pulse-knocking engine.
Summary of the invention
The technical problem that solves
Longer in order to overcome in the prior art pulse-knocking engine detonation tube length, liquid fuel is difficult to fill equably long engine knock pipe under wellatomized prerequisite, the rich oil problem is difficult to solve, the problem that engine efficiency is low, the present invention proposes a kind of detonation tube that has the pulse-knocking engine of conical inner body, can solve the problems of the prior art effectively.
Technological scheme
Technological scheme of the present invention is:
Described a kind of detonation tube that has the pulse-knocking engine of conical inner body, be connected with first oxidizer manifold at the detonation tube closed end, first fuel line and isolation airway, it is characterized in that: conical inner body is housed in the detonation tube stage casing, conical inner body is a conical structure, conical inner body is fixedlyed connected with detonation tube with second fuel line by second oxidizer manifold, the central axis of conical inner body and detonation tube central axis conllinear, and the bottom surface diameter of conical inner body is less than the internal diameter of detonation tube; On the detonation tube sidewall between detonation tube closed end and the conical inner body, igniter is housed.
The preferred version of the detonation tube of described a kind of pulse-knocking engine that has a conical inner body, it is characterized in that: conical inner body bottom center position has blind hole, and inner second fuel line with the insertion conical inner body of blind hole is connected; The conical inner body bottom surface also has annular groove, and groove is connected with second oxidizer manifold that inserts conical inner body; Conical inner body bottom center blind hole depth is greater than depth of groove.
The preferred version of the detonation tube of described a kind of pulse-knocking engine that has a conical inner body, it is characterized in that: conical inner body bottom surface diameter is 0.8～0.9 times of detonation tube internal diameter.
The preferred version of the detonation tube of described a kind of pulse-knocking engine that has a conical inner body, it is characterized in that: conical inner body length is 1.5～2 times of detonation tube internal diameter.
The preferred version of the detonation tube of described a kind of pulse-knocking engine that has a conical inner body is characterized in that: the conical point of conical inner body is 2～2.5 times of detonation tube internal diameter apart from the distance of detonation tube closed end.
The preferred version of the detonation tube of described a kind of pulse-knocking engine that has a conical inner body is characterized in that: the bottom surface of conical inner body is 7～12 times of detonation tube internal diameter apart from the distance of detonation tube external port.
The preferred version of the detonation tube of described a kind of pulse-knocking engine that has a conical inner body is characterized in that: igniter is 1～1.8 times of detonation tube internal diameter apart from the distance of detonation tube closed end.
Beneficial effect
The present invention is by being provided with conical inner body in detonation tube inside, the approximate not cavity volume of closed at both ends of the igniting intersegmental part between conical inner body and the detonation tube.Ignition mixture in the igniting section be similar to wait and holds reaction after igniting, and then the High Temperature High Pressure product of Chan Shenging is transmitted to the ignition mixture that goes to light in the pinking formation section of conical inner body rear end wherein.Igniting section role is equivalent to light a small amount of ignition mixture that injection enters with little energy source, and after ignition energy was amplified, going to light the detonation tube main body again was that pinking forms the ignition mixture in the section.Because it is all higher that the igniting section is propagated the products of combustion temperature, pressure of coming, ignition energy is bigger, can light pinking rapidly forms the ignition mixture in the section and forms detonation wave fast, thereby shortened detonation greatly to the pinking transition distance, the length of chopped pulse detonation engine detonation tube, improve the filling condition of liquid fuel, reduce oil consumption rate, improve engine performance.
Description of drawings
Fig. 1: structural representation of the present invention;
Fig. 2: the structural representation of conical inner body;
Fig. 3: the control signal sequential chart of external electric magnet valve;
Fig. 4: the pressure signal figure of three pressure transducers;
Wherein: 1, first oxidizer manifold; 2, first fuel line; 3, isolate airway; 4, first air outlet hole; 5, first oil outlet; 6, igniting section; 7, igniter; 8, conical inner body; 9, second oxidizer manifold; 10, second fuel line; 11, second oil outlet; 12, second air outlet hole; 13, pinking forms section.
Embodiment
Specifically describe the present invention below in conjunction with embodiment.
Embodiment 1:
Shown in accompanying drawing 1, described a kind of detonation tube that has the pulse-knocking engine of conical inner body is connected with first oxidizer manifold, 1, the first fuel line 2 and isolates airway 3 at the detonation tube closed end.First fuel line 2 is connected the closed end center, first oxidizer manifold 1 with isolate the relative sidewall that is connected closed end of airway 3 on, first fuel line 2 stretches into and forms first air outlet hole 4 that annular is arranged between first oil outlet, 5, the first oil outlets 5 and the detonation tube inwall in the detonation tube.In the detonation tube stage casing conical inner body 8 is housed, conical inner body 8 is a conical structure, its central axis and detonation tube central axis conllinear, and the bottom surface diameter is less than the detonation tube internal diameter.Conical inner body 8 is fixedlyed connected with detonation tube with second fuel line 10 by second oxidizer manifold 9, conical inner body 8 bottom center positions have blind hole, blind hole is inner to be connected with second fuel line 10 that inserts conical inner body, thereby the blind hole outer end forms second oil outlet 11; Conical inner body 8 bottom surfaces also have annular groove, and groove is connected with second oxidizer manifold 9 that inserts conical inner body, thereby groove forms second air outlet 12; And conical inner body bottom center blind hole depth is greater than depth of groove.On the detonation tube sidewall between this external detonation tube closed end and the conical inner body 8 igniter 7 is housed also.Be to be that pinking forms section 13. between igniting section 6, the second oil outlets 11 and second air outlet 12 and the detonation tube external port between first oil outlet 5 and first air outlet hole 4 and the conical inner body 8
In the present embodiment, the fuel of employing is aviation kerosine, and oxygenant is a compressed oxygen, and isolation gas is compressed nitrogen, adopts automobile spark plug as igniter, and ignition energy is 50mJ.Wherein the detonation tube internal diameter is 30mm, total length 380mm, conical inner body 8 length are 60mm, are 2 times of detonation tube internal diameter, the bottom surface diameter is 26mm, be 0.87 times of detonation tube internal diameter, the conical point of conical inner body 8 is 60mm apart from the distance of detonation tube closed end, is 2 times of detonation tube internal diameter, the bottom surface of conical inner body 8 is 260mm apart from the distance of detonation tube external port, be 8.67 times of detonation tube internal diameter, igniter 7 is 50mm apart from the distance of detonation tube closed end, is 1.67 times of detonation tube internal diameter.
At each fuel, on oxygenant and the isolation airway electromagnetic valve fuel is housed all, oxygenant and isolation gas break-make, the work schedule of solenoid valve and spark plug as shown in Figure 3, the control frequency of solenoid valve is 5Hz, in a control cycle, the first fuel inlet solenoid valve at first, the first oxidant inlet solenoid valve is opened, fraction kerosene and oxygen enter the engine ignition section, dutycycle is 0.3, phase place is 0 °, the while second fuel inlet solenoid valve, the second oxidant inlet solenoid valve is opened, most of kerosene and oxygen lancing are gone into pinking and are formed in the section, and dutycycle is 0.3, and phase place is 0 °; Igniter 7 igniting then, dutycycle is 0.01, phase place is 110 °; After the igniting, ignition mixture in the igniting section 6 is lighted, because igniting section 6 approximate closed at both ends, its inner near seemingly waits holds reaction, generate the products of combustion of High Temperature High Pressure, this products of combustion flows into via the space between conical inner body 8 and the detonation tube inwall that pinking forms section 13 and wherein the ignition mixture of igniting, because the product temperature, pressure is very high, ignition energy is very big, pinking forms in the section 13 can very promptly form detonation wave, detonation wave is propagated to the detonation tube outer end and is discharged detonation tube, thereby produces thrust.After treating that exhaust proceeds to a certain degree, isolating the nitrogen solenoid valve opens, isolate nitrogen and in motor, spray, prevent that next circulation from beginning to be packed into the ignition mixture generation premature firing of detonation tube to blow down the high-temperature product in igniting section 6 and the pinking formation section 13.First dutycycle of isolating the nitrogen solenoid valve is 0.3, and phase place is 251 °.A work cycle to this detonation tube finishes.Above process moves in circles, and then detonation tube can periodically produce detonation wave, thereby produces step thrust.
In the present embodiment, the supply pressure of compressed oxygen and kerosene is respectively 1.5MPa and 0.5MPa, and isolating the nitrogen supply pressure is 1.5MPa.The equivalent proportion of liquid kerosene/oxygen mixture is about 1.0.External pressure and ambient temperature are respectively 1.01325 * 10
5Pa and 288.2K.Under this experimental condition, the kerosene/oxygen gas phase detonation pressure P that calculates by pinking general-purpose computations software CEA program (Chemical Equilibrium and Applications)
0With speed V
0Be respectively 4.36MPa and 2357.5m/s.Because theoretical value fails to consider the various losses in the actual conditions, so the pressure of the detonation wave that records in the experiment is less than calculated value, this is rational.According to experiment experience, recording pressure is to think about 3.2Mpa that detonation wave forms.
On the pinking formation section 13 of detonation tube, arranged 3 pressure-measuring-point p1, p2, p3,, the piezo crystal pressure transducer has been installed on the measuring point respectively apart from ignition location 100mm, 160mm and 220mm.Provided the pressue-graph of 3 measuring points among Fig. 4, as can be seen from the figure, just formed detonation wave at first pressure-measuring-point p1 place, and motor can stably work, this measuring point is 100mm apart from the distance of spark plug 7.And according to the former experiments data, the employing Shchelkin spiral obstacle that same internal diameter is 30mm strengthens the pulse-knocking engine that detonation changes to pinking, is approximately forming detonation wave apart from ignition location 400mm place.Therefore the detonation tube structure that adopts the present invention to propose can greatly shorten the distance that detonation wave forms, thereby shortens the length of detonation tube, liquid fuel is evenly distributed easily within it, thereby improve combustion efficiency, reduces oil consumption rate, improves the performance of motor.
Embodiment 2:
In the present embodiment, detonation tube structure and embodiment's 1 difference is: conical inner body 8 length are 45mm, be 1.5 times of detonation tube internal diameter, the bottom surface diameter is 27mm, it is 0.9 times of detonation tube internal diameter, the conical point of conical inner body 8 is 75mm apart from the distance of detonation tube closed end, be 2.5 times of detonation tube internal diameter, the bottom surface of conical inner body 8 is 260mm apart from the distance of detonation tube external port, be 8.67 times of detonation tube internal diameter, igniter 7 is 30mm apart from the distance of detonation tube closed end, is 1 times of detonation tube internal diameter.
Present embodiment is tested on pulse-knocking engine, adopt the control input timing identical with embodiment 1, collected pressure curve over time at p1, p2, three pressure-measuring-points of p3, the result is presented at first pressure-measuring-point p1 place equally and has just formed detonation wave, and motor can stably be worked.
Claims (7)
1. detonation tube that has the pulse-knocking engine of conical inner body, be connected with first oxidizer manifold (1) at the detonation tube closed end, first fuel line (2) and isolation airway (3), it is characterized in that: conical inner body (8) is housed in the detonation tube stage casing, conical inner body (8) is a conical structure, conical inner body (8) is fixedlyed connected with detonation tube with second fuel line (10) by second oxidizer manifold (9), the central axis of conical inner body (8) and detonation tube central axis conllinear, the bottom surface diameter of conical inner body (8) is less than the internal diameter of detonation tube; On the detonation tube sidewall between detonation tube closed end and the conical inner body (8), igniter (7) is housed.
2. a kind of detonation tube that has the pulse-knocking engine of conical inner body according to claim 1 is characterized in that: conical inner body (8) bottom center position has blind hole, and blind hole is inner to be connected with second fuel line (10) that inserts conical inner body; Conical inner body (8) bottom surface also has annular groove, and groove is connected with second oxidizer manifold (9) that inserts conical inner body; Conical inner body bottom center blind hole depth is greater than depth of groove.
3. a kind of detonation tube that has the pulse-knocking engine of conical inner body according to claim 1 is characterized in that: conical inner body (8) bottom surface diameter is 0.8～0.9 times of detonation tube internal diameter.
4. a kind of detonation tube that has the pulse-knocking engine of conical inner body according to claim 1 is characterized in that: conical inner body (8) length is 1.5～2 times of detonation tube internal diameter.
5. a kind of detonation tube that has the pulse-knocking engine of conical inner body according to claim 1 is characterized in that: the conical point of conical inner body (8) is 2～2.5 times of detonation tube internal diameter apart from the distance of detonation tube closed end.
6. a kind of detonation tube that has the pulse-knocking engine of conical inner body according to claim 1 is characterized in that: the bottom surface of conical inner body (8) is 7～12 times of detonation tube internal diameter apart from the distance of detonation tube external port.
7. a kind of detonation tube that has the pulse-knocking engine of conical inner body according to claim 1 is characterized in that: igniter (7) is 1～1.8 times of detonation tube internal diameter apart from the distance of detonation tube closed end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010534660XA CN101975123A (en) | 2010-11-04 | 2010-11-04 | Knocking pipe with central cone of pulse knocking engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010534660XA CN101975123A (en) | 2010-11-04 | 2010-11-04 | Knocking pipe with central cone of pulse knocking engine |
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| CN101975123A true CN101975123A (en) | 2011-02-16 |
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| CN201010534660XA Pending CN101975123A (en) | 2010-11-04 | 2010-11-04 | Knocking pipe with central cone of pulse knocking engine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114320659A (en) * | 2022-01-10 | 2022-04-12 | 江苏海能动力科技有限公司 | Low-cost closed pulse detonation wind source engine |
| US20220275943A1 (en) * | 2020-06-03 | 2022-09-01 | Xi'an Thermal Power Research Institute Co.Ltd | Pulse detonation combustion system |
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2010
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220275943A1 (en) * | 2020-06-03 | 2022-09-01 | Xi'an Thermal Power Research Institute Co.Ltd | Pulse detonation combustion system |
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| CN114320659A (en) * | 2022-01-10 | 2022-04-12 | 江苏海能动力科技有限公司 | Low-cost closed pulse detonation wind source engine |
| CN114320659B (en) * | 2022-01-10 | 2023-12-26 | 江苏海能动力科技有限公司 | Low-cost closed pulse detonation wind source engine |
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Application publication date: 20110216 |