Ammonia fuel engine tribological characteristic simulation test system and test method thereof

Abstract

The invention discloses an ammonia fuel engine tribological characteristic simulation test system and a test method thereof. The ammonia fuel engine lubricating oil and piston ring-cylinder sleeve tribological characteristic test system comprises a gas management unit, a lubricating oil simulation reaction tank, a lubricating oil physicochemical property detection module and a frictional wear module. The gas management unit controls different reflection gas flows in the lubricating oil simulation reaction tank, the lubricating oil simulation reaction tank carries out artificial aging on lubricating oil, the friction wear module carries out a tribological test, and the lubricating oil physicochemical property detection module analyzes the performance of the lubricating oil; the lubricating oil simulation reaction tank, the lubricating oil physicochemical property detection module and the frictional wear module operate synchronously, and lubricating oil circularly flows among the lubricating oil simulation reaction tank, the lubricating oil physicochemical property detection module and the frictional wear module. And the influence of the uncertainty of ammonia gas escaping from the lubricating oil on the test result is effectively avoided.

Description

Technical Field

[0001] This invention relates to the technical field of engine friction and wear performance testing platforms, and in particular to a tribological characteristic simulation testing system and testing method for ammonia fuel engines. Background Technology

[0002] Marine fuels are rapidly shifting towards "low / zero carbon" fuels. Ammonia, as a hydrogen-rich zero-carbon fuel, is one of the ideal choices for ship decarbonization in the medium to long term. Advanced friction lubrication strategies are the theoretical basis for achieving high reliability and high power density in engines. However, due to the limitations of the physicochemical properties of ammonia fuel itself, problems such as corrosion of in-cylinder friction pairs, deterioration of lubricating oil performance, and deterioration of the working environment are more prominent. By conducting engine tribological characteristic simulation tests, we can test, verify, and evaluate various performance indicators of lubricating oil and key engine friction pairs under simulated working conditions, and study the influence of various factors on engine tribological characteristics, thereby providing a certain theoretical basis for the development and research of ammonia engines.

[0003] In existing experimental platforms and methods for the tribological properties of engine lubricating oils and key friction pairs, the lubricating oil is typically aged first, and then the physicochemical properties of the lubricating oil and the friction and wear tests of the friction pairs are performed offline after the aging reaction is completed. In this process, it is necessary to sample, transport, test and experiment on the ammonia-containing lubricating oil. Since the solubility of ammonia in lubricating oil is extremely low, the ammonia gas dispersed and dissolved in the lubricating oil is very easy to spill out of the lubricating oil during the transfer process, causing uncertainties and making it impossible for traditional testing methods to accurately characterize the tribological properties of ammonia engine lubricating oils and key friction pairs.

[0004] To address the aforementioned issues, this invention provides a simulation test system and method for the tribological characteristics of ammonia fuel engines, thereby resolving the problem of inaccurate simulation results of ammonia spillage interference during transport. Summary of the Invention

[0005] The purpose of this invention is to provide a tribological characteristic simulation test system and test method for ammonia fuel engines, which achieves accurate feedback of simulation test results by real-time synchronous testing of the physicochemical properties of lubricating oil and the friction and wear characteristics of key friction pairs under different working conditions.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] A tribological characteristic simulation test system for an ammonia fuel engine includes a gas management unit 101, a lubricating oil simulation reaction tank 201 connected sequentially by pipelines to form a closed loop, a lubricating oil physicochemical property detection module 301, and a friction and wear module 401. The lubricating oil simulation reaction tank 201 is used for artificial aging of the lubricating oil, the lubricating oil physicochemical property detection module 301 analyzes the performance of the lubricating oil, the friction and wear module 401 is used for tribological tests with the participation of the lubricating oil, and the gas management unit is used to supply reaction gas to the lubricating oil simulation reaction tank 201.

[0008] Preferably, the gas management unit includes a steam generator 102a, an ammonia cylinder 103a, and a compressed air cylinder 104a connected to the simulated reaction tank.

[0009] Preferably, the steam generator 102a is further connected to a steam flow controller 102b via a pipeline; the ammonia cylinder 103a is further connected to an ammonia pressure reducing valve 103b and an ammonia flow controller 103c via a pipeline; and the compressed air cylinder 104a is further connected to an air pressure reducing valve 104b and an air flow controller 104c via a pipeline.

[0010] Preferably, the steam generator 102a, the ammonia cylinder 103a, and the compressed air cylinder 104a are independent branches; it also includes a main pipeline with a one-way valve 105 at one end, the pipeline containing the steam generator 102a, the ammonia cylinder 103a, and the compressed air cylinder 104a is connected in parallel to the one-way valve 105, and the main pipeline is also equipped with a valve 106 and connected to the lubricating oil simulation reaction tank 201.

[0011] Preferably, the lubricating oil simulation reaction tank 201 includes a double-layer reaction vessel 209. An external heat source outlet 208a, an external heat source inlet 208b, and a discharge port 210 are integrated on the reaction vessel body. The reaction vessel cover integrates a one-way valve 202, a gas inlet 203, a temperature sensor 204, a stirrer 205, a lubricating oil heat preservation circulation inlet pipe 206a, and a lubricating oil heat preservation circulation outlet pipe 206b. The gas inlet 203 is used to receive gas from the gas management unit 101. The lubricating oil heat preservation circulation inlet pipe 206a and the lubricating oil heat preservation circulation outlet pipe 206b are respectively equipped with a lubricating oil circulation inlet peristaltic pump 207a and a lubricating oil circulation outlet peristaltic pump 207b.

[0012] Preferably, the lubricating oil physicochemical property detection module 301 includes a test chamber 303, and an array sensor 302a and a viscosity sensor 302b are integrated on the upper cover of the test chamber 303.

[0013] Preferably, the friction and wear module 401 includes a test fixture 402, which can perform reciprocating motion.

[0014] Preferably, the friction sensor 403, the load sensor, and the oil box 404 are all fixed on the test fixture 402. The test fixture 402 includes a lower central fixture 405 fixed to the oil box 404 by screws, and an upper fixture 406 fixed to an external clamping mechanism to perform reciprocating motion. The data of the friction sensor 403 and the load sensor are collected by a computer.

[0015] A method for simulating the tribological properties of an ammonia fuel engine includes the following steps:

[0016] Step 1: Put the lubricating oil to be tested into the double-layered reactor, turn on the stirrer, turn on the external heat source and set the reaction temperature;

[0017] Step 2: Turn on the gas management unit and introduce the set type and quantity of reaction gas;

[0018] Step 3: After the lubricating oil and gas in the double-layer reactor have been mixed for a set time, install the sample to be tested on the test fixture, start the peristaltic pump, adjust the lubricating oil flow rate, turn on the lubricating oil physicochemical property detection module, and continuously record the real-time data of the sensor after the lubricating oil has been circulated for a set time.

[0019] Step 4: Start the friction and wear module to continuously record real-time sensor data.

[0020] Preferably, in step 2, the steam generator, ammonia cylinder, and compressed air cylinder are turned on respectively, and the steam flow controller, ammonia flow controller, and compressed air flow controller are started respectively to adjust the gas flow and control the atmosphere composition, and the valves are opened.

[0021] The present invention achieves the following technical effects compared to the prior art:

[0022] 1. This invention connects a lubricating oil simulation reaction tank, a lubricating oil physicochemical property detection module, and a friction and wear module in sequence through pipelines to form a closed loop. The lubricating oil circulates in the loop, enabling simultaneous analysis and detection of the tribological properties of the lubricating oil and key friction pairs in ammonia engines. This avoids the uncertain leakage of ammonia gas caused by sampling before testing in traditional offline testing methods, and improves the authenticity, timeliness, and accuracy of the data.

[0023] 2. This invention independently supplies steam, ammonia, and compressed air with controllable flow rates to the lubricating oil simulation reaction tank through a gas management unit, which can simulate various working conditions, including but not limited to atmospheric environment, temperature, water content, load, and frequency. Various performance indicators of the lubricating oil can be directly collected in the lubricating oil simulation reaction tank.

[0024] 3. This invention is simple in design and easy to operate. It reliably collects various test data while ensuring experimental accuracy. The optimized design reduces experimental costs and saves experimental materials. The closed loop ensures the safety, greenness and environmental protection of the entire experimental process. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of the tribological characteristic simulation test system for ammonia fuel engine of the present invention;

[0027] Among them, 101 is the gas management unit; 201 is the lubricating oil simulation reaction tank; 301 is the lubricating oil physicochemical property testing module; 401 is the friction and wear module; 102a is the steam generator; 102b is the steam flow controller; 103a is the ammonia cylinder; 103b is the ammonia pressure reducing valve; 103c is the ammonia flow controller; 104a is the compressed air cylinder; 104b is the air pressure reducing valve; 104c is the air flow controller; 105 is the one-way valve; 106 is the valve; 209 is the double-layered reaction vessel; 208a is the external heat source outlet; 208b is the external... 210. Heat source inlet; 202. Discharge port; 203. One-way valve for reactor; 204. Gas inlet; 205. Temperature sensor; 206a. Lubricating oil insulation circulation inlet pipe; 206b. Lubricating oil insulation circulation outlet pipe; 207a. Lubricating oil circulation inlet peristaltic pump; 207b. Lubricating oil circulation outlet peristaltic pump; 302a. Array sensor; 302b. Viscosity sensor; 303. Test chamber; 402. Test fixture; 403. Friction sensor; 404. Oil box; 405. Lower fixture; 406. Upper fixture; 407. Peristaltic pump. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] The purpose of this invention is to provide a tribological characteristic simulation test system and test method for ammonia fuel engines, which achieves accurate feedback of simulation test results by real-time synchronous testing of the physicochemical properties of lubricating oil and the friction and wear characteristics of key friction pairs under different working conditions.

[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] refer to Figure 1 A tribological characteristic simulation test system for an ammonia fuel engine includes a gas management unit 101, a lubricating oil simulation reaction tank 201 connected sequentially by pipelines to form a closed loop, a lubricating oil physicochemical property detection module 301, and a friction and wear module 401. The lubricating oil simulation reaction tank 201 is used for artificial aging of the lubricating oil, the lubricating oil physicochemical property detection module 301 analyzes the performance of the lubricating oil, the friction and wear module 401 is used for tribological tests with the participation of the lubricating oil, and the gas management unit is used to supply reaction gas to the lubricating oil simulation reaction tank 201.

[0032] like Figure 1 As shown, the gas management unit includes a steam generator 102a, an ammonia cylinder 103a, and a compressed air cylinder 104a connected to the simulated reaction tank.

[0033] like Figure 1 As shown, the steam generator 102a is connected to a steam flow controller 102b via a pipeline; the ammonia cylinder 103a is connected to an ammonia pressure reducing valve 103b and an ammonia flow controller 103c via a pipeline; the compressed air cylinder 104a is connected to an air pressure reducing valve 104b and an air flow controller 104c via a pipeline. The flow rates of compressed air, ammonia, and steam can all be adjusted individually via the flow controller 103c, with an adjustment range of 0-500 ml / min.

[0034] like Figure 1 As shown, the steam generator 102a, the ammonia cylinder 103a, and the compressed air cylinder 104a are independent branches; it also includes a main pipeline with a one-way valve 105 at one end. The pipeline containing the steam generator 102a, the ammonia cylinder 103a, and the compressed air cylinder 104a is connected in parallel to the one-way valve 105. A valve 106 is also provided on the main pipeline and connected to the lubricating oil simulation reaction tank 201.

[0035] like Figure 1As shown, the lubricating oil simulation reaction tank 201 includes a double-layered reactor 209. The reactor body integrates an external heat source outlet 208a, an external heat source inlet 208b, and a discharge port 210. The reactor cover integrates a one-way valve 202, a vent 203, a temperature sensor 204, a stirrer 205, a lubricating oil heat preservation circulation inlet pipe 206a, and a lubricating oil heat preservation circulation outlet pipe 206b. The double-layered reactor 209 can be connected to an external heat source, and the temperature control range is -30℃ to 3℃. The temperature is within ±1℃; the stirrer speed is 0-3000r / min; the air inlet 203 is used to receive gas from the gas management unit 101; the lubricating oil heat preservation circulation inlet pipe 206a and the lubricating oil heat preservation circulation outlet pipe 206b are respectively equipped with a lubricating oil circulation inlet peristaltic pump 207a and a lubricating oil circulation outlet peristaltic pump 207b to control the lubricating oil flow rate and flow direction; the lubricating oil flow rate control accuracy is ±0.1-100mL / min.

[0036] like Figure 1 As shown, the lubricating oil physicochemical property detection module 301 includes a test chamber 303. An array sensor 302a and a viscosity sensor 302b are integrated on the upper cover of the test chamber 303. The array sensor 302a can measure the lubricating oil temperature, with a temperature measurement range of 0-200℃ and an error range of ±0.5℃; the density measurement range is 600-1250 kg / m³. 3 Error range ±5kg / m 3 The water activity measurement range is 0-1 aw, with an error range of ±0.03 aw; the trace moisture measurement range is 0-5000 ppm, with an error range of ±18 ppm; the dielectric constant measurement range is 1-6, with an error range of ±2%; the viscosity sensor is used to measure the viscosity of lubricating oil, with a measurement range of 1-2000 cp and an error range of ±5 cp; the data from the array sensor and the viscosity sensor are acquired by a computer.

[0037] like Figure 1 As shown, the friction and wear module 401 includes a test fixture 402, which can perform reciprocating motion.

[0038] like Figure 1 As shown, the friction sensor 403, load sensor, and oil box 404 are all fixed on the test fixture 402. The friction sensor has a measurement range of 0-500N and an error of ±1N. The load sensor has a measurement range of 0-2000N and an error of ±5N. The test fixture 402 includes a lower fixture 405 fixed to the oil box 404 by screws, and an upper fixture 406 fixed to an external clamping mechanism for reciprocating motion. The data from the friction sensor 403 and the load sensor are acquired by a computer.

[0039] A method for simulating the tribological properties of an ammonia fuel engine includes the following steps:

[0040] Step 1: Put the lubricating oil to be tested into the double-layer reactor 209, turn on the stirrer 205, turn on the external heat source and set the reaction temperature;

[0041] Step 2: Turn on the gas management unit 101 and introduce the set type and quantity of reaction gas;

[0042] Step 3: After the lubricating oil and gas in the double-layer reactor 209 have been mixed for 1-10 hours, install the sample to be tested on the test fixture 402, start the peristaltic pump, adjust the lubricating oil flow rate, turn on the lubricating oil physicochemical property detection module 301, and continuously record the real-time data of the sensor after the lubricating oil has circulated for 0.5-3 hours.

[0043] Step 4: Start the friction and wear module 401 to continuously record real-time sensor data.

[0044] Preferably, in step 2, the steam generator 102a, ammonia cylinder 103a, and compressed air cylinder 104a are turned on respectively, and the steam flow controller 102b, ammonia flow controller 103c, and compressed air flow controller 104c are started respectively to adjust the gas flow and control the atmosphere composition, and the valves are opened.

[0045] Example 1:

[0046] The lubricating oil to be tested was placed into the double-layer reactor 209, the stirrer 205 was turned on, the speed of the stirrer 205 was set to 300 r / min, the external heat source was turned on and the reaction temperature was set to 45℃; the ammonia gas cylinder 103a and the ammonia gas flow controller 103c were turned on respectively, the ammonia gas flow rate was adjusted to 100 ml / min, and the valve was opened; after the lubricating oil and gas in the double-layer reactor 209 were mixed for 2 hours, the peristaltic pump was started, the lubricating oil flow rate was adjusted to 50 ml / min, and then the lubricating oil physicochemical property detection module 301 was turned on, the lubricating oil was circulated for 0.5, 1 and 2 hours respectively, and the real-time data of the sensor was recorded respectively;

[0047] Example 2:

[0048] The lubricating oil to be tested was placed in the double-layer reactor 209, the stirrer 205 was turned on, the speed of the stirrer 205 was set to 300 r / min, the external heat source was turned on and the reaction temperature was set to 25℃; the compressed air flow controller 104c was turned on, the gas flow rate was adjusted to 100 ml / min, and the valve was opened; after the lubricating oil and gas in the double-layer reactor 209 were mixed for 2 hours, the piston ring-cylinder liner sample was loaded onto the friction and wear module 401. After loading, the peristaltic pump was started, the lubricating oil flow rate was adjusted to 50 ml / min, the friction and wear module 401 was started, the load was set to 100 N, the frequency was 1 Hz, the test time was 3 h, and the real-time data of the sensor was continuously recorded.

[0049] Example 3:

[0050] The lubricating oil to be tested was placed in the double-layer reactor 209, the stirrer 205 was turned on, the speed of the stirrer 205 was set to 300 r / min, the external heat source was turned on and the reaction temperature was set to 25℃; the compressed ammonia flow controller 103c was turned on, the gas flow rate was adjusted to 100 ml / min, and the valve was opened; after the lubricating oil and gas in the double-layer reactor 209 were mixed for 2 hours, the piston ring-cylinder liner sample was loaded onto the friction and wear module 401. After loading, the peristaltic pump was started, the lubricating oil flow rate was adjusted to 50 ml / min, the friction and wear module 401 was started, the load was set to 100 N, the frequency was 1 Hz, the test time was 3 h, and the real-time data of the sensor was continuously recorded.

[0051] Example 4:

[0052] The lubricating oil to be tested was placed in a double-layered reactor 209. The stirrer 205 was turned on and its speed was set to 300 r / min. The external heat source was turned on and the reaction temperature was set to 25℃. The compressed ammonia flow controller 103c was turned on and the gas flow rate was adjusted to 100 ml / min. The valve was opened. After the lubricating oil and gas in the double-layered reactor 209 were mixed for 2 hours, the test device was turned off and allowed to stand for 24 hours. After standing, the gas control unit was disconnected, the external heat source was turned on again and the reaction temperature was set to 25℃. The piston ring-cylinder liner sample was loaded onto the friction and wear module 401. After loading, the peristaltic pump was started and the lubricating oil flow rate was adjusted to 50 ml / min. The friction and wear module 401 was started, and the load was set to 100 N, the frequency to 1 Hz, and the test time to 3 hours. The real-time data of the sensor was continuously recorded.

[0053] Example 5:

[0054] The lubricating oil to be tested was placed in the double-layer reactor 209, the stirrer 205 was turned on, the speed of the stirrer 205 was set to 300 r / min, the external heat source was turned on and the reaction temperature was set to 80℃; the compressed air flow controller 104c was turned on, the gas flow rate was adjusted to 100 ml / min, and the valve was opened; after the lubricating oil and gas in the double-layer reactor 209 were mixed for 2 hours, the piston ring-cylinder liner sample was loaded onto the friction and wear module 401. After loading, the peristaltic pump was started, the lubricating oil flow rate was adjusted to 50 ml / min, the friction and wear module 401 was started, the load was set to 100 N, the frequency was 1 Hz, the test time was 3 h, and the real-time data of the sensor was continuously recorded.

[0055] Example 6:

[0056] The lubricating oil to be tested was placed in the double-layer reactor 209, the stirrer 205 was turned on, the speed of the stirrer 205 was set to 300 r / min, the external heat source was turned on and the reaction temperature was set to 80℃; the compressed ammonia flow controller 103c was turned on, the gas flow rate was adjusted to 100 ml / min, and the valve was opened; after the lubricating oil and gas in the double-layer reactor 209 were mixed for 2 hours, the piston ring-cylinder liner sample was loaded onto the friction and wear module 401. After loading, the peristaltic pump was started, the lubricating oil flow rate was adjusted to 50 ml / min, the friction and wear module 401 was started, the load was set to 100 N, the frequency was 1 Hz, the test time was 3 h, and the real-time data of the sensor was continuously recorded.

[0057] Example 7:

[0058] The lubricating oil to be tested was placed in the double-layer reactor 209. The stirrer 205 was turned on and its speed was set to 300 r / min. The external heat source was turned on and the reaction temperature was set to 80℃. The compressed ammonia flow controller 103c was turned on and the gas flow rate was adjusted to 100 ml / min. The valve was opened. After the lubricating oil and gas in the double-layer reactor 209 were mixed for 2 hours, the test device was turned off and allowed to stand for 24 hours. After standing, the gas control unit was disconnected, the external heat source was turned on again and the reaction temperature was set to 80℃. The piston ring-cylinder liner sample was loaded onto the friction and wear module 401. After loading, the peristaltic pump was started and the lubricating oil flow rate was adjusted to 50 ml / min. The friction and wear module 401 was started, and the load was set to 100 N, the frequency to 1 Hz, and the test time to 3 hours. The real-time data of the sensor was continuously recorded.

[0059] Example 8:

[0060] The lubricating oil to be tested was placed in the double-layer reactor 209, the stirrer 205 was turned on, the speed of the stirrer 205 was set to 300 r / min, the external heat source was turned on and the reaction temperature was set to 150℃; the compressed air flow controller 104c was turned on, the gas flow rate was adjusted to 100 ml / min, and the valve was opened; after the lubricating oil and gas in the double-layer reactor 209 were mixed for 2 hours, the piston ring-cylinder liner sample was loaded onto the friction and wear module 401. After loading, the peristaltic pump was started, the lubricating oil flow rate was adjusted to 50 ml / min, the friction and wear module 401 was started, the load was set to 100 N, the frequency was 1 Hz, the test time was 3 h, and the real-time data of the sensor was continuously recorded.

[0061] Example 9:

[0062] The lubricating oil to be tested was placed in the double-layer reactor 209, the stirrer 205 was turned on, the speed of the stirrer 205 was set to 300 r / min, the external heat source was turned on and the reaction temperature was set to 150℃; the compressed ammonia flow controller 103c was turned on, the gas flow rate was adjusted to 100 ml / min, and the valve was opened; after the lubricating oil and gas in the double-layer reactor 209 were mixed for 2 hours, the piston ring-cylinder liner sample was loaded onto the friction and wear module 401. After loading, the peristaltic pump was started, the lubricating oil flow rate was adjusted to 50 ml / min, the friction and wear module 401 was started, the load was set to 100 N, the frequency was 1 Hz, the test time was 3 h, and the real-time data of the sensor was continuously recorded.

[0063] Example 10:

[0064] The lubricating oil to be tested was placed in the double-layer reactor 209. The stirrer 205 was turned on and its speed was set to 300 r / min. The external heat source was turned on and the reaction temperature was set to 150℃. The compressed ammonia flow controller 103c was turned on and the gas flow rate was adjusted to 100 ml / min. The valve was opened. After the lubricating oil and gas in the double-layer reactor 209 were mixed for 2 hours, the test device was turned off and allowed to stand for 24 hours. After standing, the gas control unit was disconnected, the external heat source was turned on again and the reaction temperature was set to 150℃. The piston ring-cylinder liner sample was loaded onto the friction and wear module 401. After loading, the peristaltic pump was started and the lubricating oil flow rate was adjusted to 50 ml / min. The friction and wear module 401 was started, and the load was set to 100 N, the frequency to 1 Hz, and the test time to 3 hours. The real-time data of the sensor was continuously recorded.

[0065] The final data for the lubricating oil are shown in Table 1:

[0066] Table 1. Performance indicators of different lubricating oils under ammonia and air atmospheres (Example 1)

[0067]

[0068]

[0069] After the experiment was completed, tables of friction coefficient cancellation and average friction coefficient under different conditions were drawn.

[0070] Table 2. Average tribological coefficients of piston ring-cylinder liner systems under different test conditions (Examples 2-9)

[0071]

[0072] Table 3. Cylinder liner wear rate under different test conditions (Examples 2-9)

[0073]

[0074] Table 4. Surface element content of worn cylinder liners under different test conditions (Examples 2-9)

[0075]

[0076] The results of the examples show that the online study of the tribological properties of lubricating oil and piston ring-cylinder liner using the test system and method of the present invention can better reflect the influence of ammonia fuel on the tribological properties of the engine, and can also avoid the uncertainty of ammonia escape in the offline test process of traditional test methods where the reaction is carried out first and then detected.

[0077] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A tribological characteristic simulation test system for an ammonia fuel engine, characterized in that, The system includes a gas management unit (101), a lubricating oil simulation reaction tank (201) connected in sequence by pipelines to form a closed loop, a lubricating oil physicochemical property testing module (301), and a friction and wear module (401). The lubricating oil simulation reaction tank (201) is used to artificially age the lubricating oil. The lubricating oil physicochemical property testing module (301) analyzes the performance of the lubricating oil. The friction and wear module (401) is used for tribological tests with the participation of lubricating oil. The gas management unit is used to supply reaction gas to the lubricating oil simulation reaction tank (201).

2. The tribological characteristic simulation test system for an ammonia fuel engine according to claim 1, characterized in that, The gas management unit includes a steam generator (102a), an ammonia cylinder (103a), and a compressed air cylinder (104a) connected to the simulated reaction tank.

3. The tribological characteristic simulation test system for an ammonia fuel engine according to claim 2, characterized in that, The steam generator (102a) is connected to a steam flow controller (102b) via a pipeline; the ammonia cylinder (103a) is connected to an ammonia pressure reducing valve (103b) and an ammonia flow controller (103c) via a pipeline; the compressed air cylinder (104a) is connected to an air pressure reducing valve (104b) and an air flow controller (104c) via a pipeline.

4. The tribological characteristic simulation test system for an ammonia fuel engine according to claim 3, characterized in that, The steam generator (102a), the ammonia cylinder (103a), and the compressed air cylinder (104a) are independent branches; it also includes a main pipeline with a one-way valve (105) at one end, the pipeline containing the steam generator (102a), the ammonia cylinder (103a), and the compressed air cylinder (104a) is connected in parallel to the one-way valve (105), and the main pipeline is also equipped with a valve (106) and connected to the lubricating oil simulation reaction tank (201).

5. The tribological characteristic simulation test system for an ammonia fuel engine according to claim 1, characterized in that, The simulated lubricating oil reaction tank (201) includes a double-layered reactor (209). An external heat source outlet (208a), an external heat source inlet (208b), and a discharge port (210) are integrated on the reactor body. The reactor cover integrates a one-way valve (202), a gas inlet (203), a temperature sensor (204), a stirrer (205), a lubricating oil heat preservation circulation inlet pipe (206a), and a lubricating oil heat preservation circulation outlet pipe (206b). The gas inlet (203) is used to receive gas from the gas management unit (101). The lubricating oil heat preservation circulation inlet pipe (206a) and the lubricating oil heat preservation circulation outlet pipe (206b) are respectively equipped with a lubricating oil circulation inlet peristaltic pump (207a) and a lubricating oil circulation outlet peristaltic pump (207b).

6. The tribological characteristic simulation test system for an ammonia fuel engine according to claim 1, characterized in that, The lubricating oil physicochemical property detection module (301) includes a test chamber (303), and an array sensor (302a) and a viscosity sensor (302b) are integrated on the upper cover of the test chamber (303).

7. The tribological characteristic simulation test system for an ammonia fuel engine according to claim 1, characterized in that, The friction and wear module (401) includes a test fixture (402) which can reciprocate.

8. The tribological characteristic simulation test system for an ammonia fuel engine according to claim 7, characterized in that, The friction sensor (403), load sensor, and oil box (404) are all fixed on the test fixture (402). The test fixture (402) includes a lower central fixture (405) fixed to the oil box (404) by screws, and an upper fixture (406) fixed to an external clamping mechanism to perform reciprocating motion. The data of the friction sensor (403) and the load sensor are collected by a computer.

9. A method for simulating the tribological characteristics of an ammonia fuel engine, characterized in that, The application of the ammonia fuel engine tribological characteristic simulation test system according to any one of claims 1 to 8 includes the following steps: Step 1: Put the lubricating oil to be tested into the double-layered reactor, turn on the stirrer, turn on the external heat source and set the reaction temperature; Step 2: Turn on the gas management unit and introduce the set type and quantity of reaction gas; Step 3: After the lubricating oil and gas in the double-layer reactor have been mixed for a set time, install the sample to be tested on the test fixture, start the peristaltic pump, adjust the lubricating oil flow rate, turn on the lubricating oil physicochemical property detection module, and continuously record the real-time data of the sensor after the lubricating oil has been circulated for a set time. Step 4: Start the friction and wear module to continuously record real-time sensor data.

10. The method for simulating the tribological characteristics of an ammonia fuel engine according to claim 9, characterized in that, In step 2, the steam generator, ammonia cylinder, and compressed air cylinder are turned on respectively, and the steam flow controller, ammonia flow controller, and compressed air flow controller are started respectively to adjust the gas flow and control the atmosphere composition, and the valves are opened.

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