CN111636989A - Measuring device for ignition and combustion lag period of jet spray at high and low temperatures - Google Patents
Measuring device for ignition and combustion lag period of jet spray at high and low temperatures Download PDFInfo
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- CN111636989A CN111636989A CN202010352564.7A CN202010352564A CN111636989A CN 111636989 A CN111636989 A CN 111636989A CN 202010352564 A CN202010352564 A CN 202010352564A CN 111636989 A CN111636989 A CN 111636989A
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Abstract
The invention discloses a measuring device for the ignition and combustion lag period of jet spray at high and low temperatures, which comprises: the device comprises a light path component, two PMT sensors, an oscilloscope and a data acquisition terminal; the optical path component includes: the optical fiber amplifier is characterized in that a first convex lens, a second convex lens, an optical fiber focusing lens, an optical fiber magnifying lens, a 340nm high-pass filter and a 510nm high-pass filter, as well as a 307nm band-pass filter and a 470nm band-pass filter are sequentially arranged; the 340nm high-pass filter and the 510nm high-pass filter are arranged in a splayed shape; the 307nm band-pass filter receives light reflected by the 340nm high-pass filter; the 470nm band-pass filter receives the light reflected by the 510nm high-pass filter; one PMT sensor is opposite to the 307nm band-pass filter, and the other PMT sensor is opposite to the 470nm band-pass filter; the two PMT sensors are electrically connected with the input end of the oscilloscope, and the output end of the oscilloscope is electrically connected with the data acquisition terminal; the invention can simultaneously measure the high-temperature ignition and low-temperature ignition and stagnation periods of single jet spray, and improves the measurement precision of the low-temperature ignition and stagnation periods of the jet spray.
Description
Technical Field
The invention belongs to the technical field of spray ignition test, and particularly relates to a device for measuring ignition stagnation periods of high and low temperature of jet spray.
Background
The jet spray ignition process is important in the proper operation of power machines, especially diesel engines that operate in a cyclic manner. When the diesel engine works normally, high-pressure fuel oil sprayed into the cylinder can generate spontaneous combustion in a high-temperature environment, and gas in the cylinder is heated and expanded to work. The time interval from the start of the spray to the auto-ignition of the spray is called the ignition lag phase. The ignition and flame holding period has a great influence on the engine performance: the long flame retardation period, the large proportion of the diesel steam evaporated during ignition, the rapid rise of the pressure in the cylinder caused by the simultaneous ignition of the diesel steam, the rough operation of the engine and the large noise; conversely, a short period of retarded combustion results in a softer engine operation and reduced noise. Therefore, the jet spray ignition and flame retardation period is always the key research content of researchers at home and abroad.
Researchers have recently found that there is a clear two-stage signature of the ignition process of jet sprays in low temperature environments, as hydrocarbon fuels exhibit different reaction paths in high temperature and low temperature environments: a low-temperature ignition stage and a high-temperature ignition stage. The combustion lag period of the two stages of ignition is respectively low-temperature ignition combustion lag period and high-temperature ignition combustion lag period. The current methods for measuring the combustion lag period of jet spray ignition mainly comprise four methods, namely a pressure curve method, a temperature curve method, a flame natural luminescence method and a flame induced fluorescence method. The ignition time of the spray is judged according to the turning point of a working medium temperature-pressure curve in a fixed volume by a pressure and temperature curve method; the flame spontaneous combustion luminescence method utilizes a photosensitive camera to measure the time when bright spots appear in a view field so as to judge the ignition time of the spray; the flame-induced fluorescence method determines the ignition timing of the spray by measuring the occurrence timing of a specific substance in the spray.
Because optical measurement is difficult to perform on an actual engine, the pressure and temperature curve method is widely applied to the actual engine. However, since the temperature of the in-cylinder pressure is turned only when the chemical reaction in the in-cylinder reaches a certain cumulative level, there is hysteresis in measuring the spray ignition in the constant volume experimental apparatus by this method. The flame natural light-emitting method is used for testing the flame lag period, and the influence of the set parameters such as the sensitivity intensity, the aperture size and the shutter time of the test equipment is large, so that the error is large. Meanwhile, the two methods can only measure the high-temperature ignition and flame retardation period, but cannot measure the high-pressure spray low-temperature ignition and flame retardation period. The flame-induced fluorescence method can represent the high-temperature and low-temperature combustion-sustaining periods by measuring the occurrence moments of different intermediate products, however, the high-temperature and low-temperature combustion-sustaining periods of the spray can be measured only after a single spray is shot and multiple sprays are measured due to the fact that the laser shooting frequency of the conventional flame-induced fluorescence method is relatively low, so that the high-temperature and low-temperature combustion-sustaining periods measured by the measuring method are not from one spray, the inconsistency among the sprays is ignored, and the error is relatively large.
In summary, the current method for measuring the ignition and combustion lag phase of jet spray cannot accurately measure the low-temperature ignition and combustion lag phase of jet spray, and in order to research the problem of two-stage ignition in the low-temperature environment of jet spray, a novel device for measuring the high-temperature and low-temperature combustion lag phase of spray is urgently needed.
Disclosure of Invention
In view of the above, according to the characteristics of fast speed and high transient performance in the jet spray ignition process, the invention provides a device for measuring the ignition lag phase of high and low temperature of jet spray, which can simultaneously measure the ignition lag phase of high and low temperature of single jet spray, improve the defects of the existing measuring method and improve the measuring precision of the ignition lag phase of low temperature of jet spray.
The invention is realized by the following technical scheme:
a measuring device for the ignition and combustion lag period of high and low temperature of jet spray comprises: the device comprises a light path component, two PMT sensors, an oscilloscope and a data acquisition terminal;
the part to be measured is a spraying constant-volume combustion bomb device, an oil sprayer of the spraying constant-volume combustion bomb device is used for spraying oil, the sprayed oil generates jet spray, and the jet spray can burn at high temperature;
the optical path component includes: the optical fiber amplifier comprises a first convex lens, a second convex lens, an optical fiber focusing lens, an optical fiber magnifying lens, a 340nm high-pass filter, a 307nm band-pass filter, a 510nm high-pass filter and a 470nm band-pass filter;
the diameter of the first convex lens is larger than that of the second convex lens;
the first convex lens, the second convex lens, the optical fiber focusing lens, the optical fiber and the optical fiber magnifying lens are coaxially arranged in sequence; the spraying constant-volume combustion bomb device and the second convex lens are respectively positioned on two sides of the first convex lens;
the 340nm high-pass filter and the 510nm high-pass filter are arranged in an splayed shape, and the 340nm high-pass filter is positioned between the optical fiber magnifier and the 510nm high-pass filter; the 340nm high-pass filter is used for reflecting light with the wavelength less than 340nm and passing light with the wavelength about or equal to 340 nm; the 510nm high-pass filter is used for reflecting light with the wavelength less than 510nm and passing light with the wavelength about or equal to 510 nm;
the 307nm band-pass filter is arranged above the 340nm high-pass filter and can receive light reflected by the 340nm high-pass filter; the 307nm band-pass filter is used for passing light with the wavelength of 302 nm-312 nm;
the 470nm band-pass filter is arranged below the 510nm high-pass filter and can receive light reflected by the 510nm high-pass filter; the 470nm band-pass filter is used for passing light with the wavelength of 455 nm-485 nm;
the two PMT sensors are respectively a first PMT sensor and a second PMT sensor; the light-sensitive hole of the first PMT sensor is opposite to the 307nm band-pass filter, and the light-sensitive hole of the second PMT sensor is opposite to the 470nm band-pass filter; the first PMT sensor is used for converting the collected light with the wavelength of 302 nm-312 nm into an electric signal; the second PMT sensor is used for converting the collected light with the wavelength of 455-485 nm into an electric signal;
the two PMT sensors are electrically connected with the input end of the oscilloscope, the output end of the oscilloscope is electrically connected with the data acquisition terminal, the oscilloscope is used for receiving two electric signals sent by the two PMT sensors, recording and displaying the two electric signals, meanwhile, the two electric signals are sent to the data acquisition terminal, and the data acquisition terminal is used for analyzing and resolving the two electric signals to obtain the combustion characteristic of jet flow spraying of the spraying constant-volume combustion bomb device.
Furthermore, the first convex lens and the second convex lens are made of quartz materials.
Further, the included angles between the 340nm high-pass filter and the 510nm high-pass filter and the axis of the optical fiber magnifier are both 45 degrees; the 307nm band-pass filter is parallel to the axis of the optical fiber magnifier; the 470nm band-pass filter is parallel to the axis of the optical fiber magnifier.
Has the advantages that: in the process of single jet spray combustion, the invention can simultaneously and accurately measure the high-temperature and low-temperature ignition and stagnation periods of single jet spray, and improves the measurement accuracy of the low-temperature ignition and stagnation periods of the jet spray.
Drawings
FIG. 1 is a structural component diagram of the present invention;
FIG. 2 is a structural component diagram of an optical path component;
the device comprises a 1-spraying constant-volume combustion bomb device, a 2-first convex lens, a 3-second convex lens, a 4-optical fiber focusing lens, a 5-optical fiber, a 6-optical fiber magnifying lens, a 7-340nm high-pass filter, an 8-510nm high-pass filter, a 9-307nm band-pass filter, a 10-470nm band-pass filter, a 11-first PMT sensor, a 12-second PMT sensor, a 15-oscilloscope and a 16-data acquisition terminal.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The embodiment provides a device for measuring the ignition and combustion lag period of high and low temperature of jet spray, referring to the attached figure 1, comprising: the device comprises a light path component, two PMT sensors, an oscilloscope 15 and a data acquisition terminal 16;
the part to be measured is a spraying constant-volume combustion bomb device 1, an oil sprayer of the spraying constant-volume combustion bomb device 1 is used for spraying oil, the sprayed oil generates jet spray, and the jet spray can burn at high temperature;
referring to fig. 2, the optical path assembly includes: the device comprises a first convex lens 2, a second convex lens 3, an optical fiber focusing lens 4, an optical fiber 5, an optical fiber magnifier 6, a 340nm high-pass filter 7, a 307nm band-pass filter 9, a 510nm high-pass filter 8 and a 470nm band-pass filter 10;
the first convex lens and the second convex lens are made of quartz materials, and the diameter of the first convex lens is larger than that of the second convex lens;
the first convex lens 2, the second convex lens 3, the optical fiber focusing lens 4, the optical fiber 5 and the optical fiber magnifying lens 6 are sequentially and coaxially arranged;
the 340nm high-pass filter 7 and the 510nm high-pass filter 8 are arranged in an inverted V shape, and the 340nm high-pass filter 7 is positioned between the optical fiber magnifier 6 and the 510nm high-pass filter 8; the included angles of the 340nm high-pass filter 7 and the 510nm high-pass filter 8 with the axis of the optical fiber magnifier 6 are both 45 degrees; the 340nm high-pass filter is used for reflecting light with the wavelength less than 340nm and passing light with the wavelength about or equal to 340 nm; the 510nm high-pass filter is used for reflecting light with the wavelength less than 510nm and passing light with the wavelength about or equal to 510 nm;
the 307nm band-pass filter 9 is arranged right above the 340nm high-pass filter 7, and the 307nm band-pass filter 9 is parallel to the axis of the optical fiber magnifier 6; the 307nm band-pass filter is used for passing light with the wavelength of 302 nm-312 nm;
the 470nm band-pass filter 10 is arranged right below the 510nm high-pass filter 8, and the 470nm band-pass filter 10 is parallel to the axis of the optical fiber magnifier 6; the 470nm band-pass filter is used for passing light with the wavelength of 455 nm-485 nm;
the two PMT sensors are respectively a first PMT sensor 11 and a second PMT sensor 12; the light-sensitive hole of the first PMT sensor 11 is opposite to the 307nm band-pass filter 9, and the light-sensitive hole of the second PMT sensor 12 is opposite to the 470nm band-pass filter 10;
the spraying constant-volume combustion bomb device 1 is arranged on one side of the first convex lens 2, which is not provided with the second convex lens 3, namely the spraying constant-volume combustion bomb device 1 and the second convex lens 3 are respectively positioned on two sides of the first convex lens 2; after light generated by jet flow spray combustion of the spray constant volume combustion bomb device 1 sequentially passes through the first convex lens 2, the second convex lens 3, the optical fiber focusing lens 4, the optical fiber 5 and the optical fiber magnifying lens 6, light with the wavelength less than 340nm is reflected by the 340nm high-pass filter 7 to form first light split, light with the wavelength of 302 nm-312 nm in the first light split passes through the 307nm band-pass filter 9, light spots of the light pass through a light-sensitive hole of the first PMT sensor 12, and the first PMT sensor 12 is used for converting the collected light with the wavelength of 302 nm-312 nm into an electric signal; light with the wavelength of about or equal to 340nm passes through a 340nm high-pass filter 7 to form second split light, light with the wavelength of less than 510nm in the second split light is reflected by a 510nm high-pass filter 8 to form third split light, after the light with the wavelength of 455 nm-485 nm in the third split light passes through a 470nm band-pass filter 10, light spots of the light pass through a photosensitive hole of a second PMT sensor 12, and the second PMT sensor 12 is used for converting the collected light with the wavelength of 455 nm-485 nm into an electric signal; the light with the wavelength of about or equal to 510nm in the second split light passes through a 510nm high-pass filter 8;
the two PMT sensors are electrically connected with the input end of the oscilloscope 15, the output end of the oscilloscope 15 is electrically connected with the data acquisition terminal 17, the oscilloscope 15 is used for receiving two electric signals sent by the two PMT sensors, recording and displaying the two electric signals, meanwhile, the two electric signals are sent to the data acquisition terminal 17, and the data acquisition terminal 17 is used for analyzing and resolving the two electric signals to obtain the combustion characteristic of the jet spray of the spray constant volume combustion bomb device 1.
The test procedure of the measuring apparatus of the present embodiment is as follows:
the method comprises the following steps: testing the light path component by using parallel light with the diameter of 100mm to ensure that light spots of the first light splitting and the third light splitting are respectively positioned in the corresponding photosensitive holes of the PMT sensor;
step two: connecting an oil injection controller of the spraying constant-volume combustion bomb device 1 to a trigger end of an oscilloscope 15;
step three: adjusting the pressure and temperature of jet flow spraying of an oil sprayer of the spraying constant-volume combustion bomb device 1 and the oil spraying duration to set values;
step four: controlling the oil sprayer to spray jet flow and generate combustion through the oil spraying controller, triggering the oscilloscope 15 to start up to work, recording the electric signals of the two PMT sensors by the oscilloscope 15, and displaying the waveforms of the two electric signals;
step five: the data acquisition terminal 17 analyzes and resolves two electric signals, wherein the first rising moment of the electric signal of the first PMT sensor 11 is a high-temperature combustion lag period; the first rise of the electrical signal of the second PMT sensor 12 is a low-temperature stagnation period.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A measuring device for the ignition and combustion lag phase of jet spray at high and low temperatures is characterized by comprising: the device comprises a light path component, two PMT sensors, an oscilloscope (15) and a data acquisition terminal (16);
the part to be measured is a spraying constant-volume combustion bomb device (1), a fuel injector of the spraying constant-volume combustion bomb device (1) is used for spraying oil, the sprayed oil generates jet spray, and the jet spray can burn at high temperature;
the optical path component includes: the device comprises a first convex lens (2), a second convex lens (3), an optical fiber focusing lens (4), an optical fiber (5), an optical fiber magnifying lens (6), a 340nm high-pass filter (7), a 307nm band-pass filter (9), a 510nm high-pass filter (8) and a 470nm band-pass filter (10);
the diameter of the first convex lens is larger than that of the second convex lens;
the first convex lens (2), the second convex lens (3), the optical fiber focusing lens (4), the optical fiber (5) and the optical fiber magnifying lens (6) are sequentially and coaxially arranged; the spraying constant-volume combustion bomb device (1) and the second convex lens (3) are respectively positioned on two sides of the first convex lens (2);
the 340nm high-pass filter (7) and the 510nm high-pass filter (8) are arranged in an inverted V shape, and the 340nm high-pass filter (7) is positioned between the optical fiber magnifier (6) and the 510nm high-pass filter (8); the 340nm high-pass filter (7) is used for reflecting light with the wavelength less than 340nm and passing light with the wavelength about or equal to 340 nm; the 510nm high-pass filter (8) is used for reflecting light with the wavelength less than 510nm and passing light with the wavelength about or equal to 510 nm;
the 307nm band-pass filter (9) is arranged above the 340nm high-pass filter (7) and can receive the light reflected by the 340nm high-pass filter (7); the 307nm band-pass filter (9) is used for passing light with the wavelength of 302 nm-312 nm;
the 470nm band-pass filter (10) is arranged below the 510nm high-pass filter (8) and can receive the light reflected by the 510nm high-pass filter (8); the 470nm band-pass filter (10) is used for passing light with the wavelength of 455 nm-485 nm;
the two PMT sensors are respectively a first PMT sensor (11) and a second PMT sensor (12); the light-sensitive hole of the first PMT sensor (11) is opposite to the 307nm band-pass filter (9), and the light-sensitive hole of the second PMT sensor (12) is opposite to the 470nm band-pass filter (10); the first PMT sensor (12) is used for converting the collected light with the wavelength of 302 nm-312 nm into an electric signal; the second PMT sensor (12) is used for converting the collected light with the wavelength of 455-485 nm into an electric signal;
the two PMT sensors are electrically connected with the input end of the oscilloscope (15), the output end of the oscilloscope (15) is electrically connected with the data acquisition terminal (17), the oscilloscope (15) is used for receiving two electric signals sent by the two PMT sensors, recording and displaying the two electric signals, meanwhile, the two electric signals are sent to the data acquisition terminal (17), and the data acquisition terminal (17) is used for analyzing and resolving the two electric signals to obtain the combustion characteristic of the jet spray of the spray constant volume combustion bomb device (1).
2. The apparatus for measuring the ignition and combustion lag of a high and a low temperature of a jet spray according to claim 1, wherein the first and the second convex lenses are made of quartz material.
3. The device for measuring the ignition and combustion lag phase at high and low temperatures by jet spray as claimed in claim 1, wherein the included angles between the 340nm high-pass filter (7) and the 510nm high-pass filter (8) and the axis of the optical fiber magnifier (6) are both 45 degrees; the 307nm band-pass filter (9) is parallel to the axis of the optical fiber magnifier (6); the 470nm band-pass filter (10) is parallel to the axis of the optical fiber magnifier (6).
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