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HỘI THẢO QUỐC TẾ ATiGB LẦN THỨ CHÍN - The 9 ATiGB 2024 187

temperature-resistant zone of the nozzle pushbar is The flow of air through the particles of the syringe
the section in direct contact with combustible gases, varies in speed. At the end of the nozzle, the speed of
with the maximum temperature under operating the air tends to slow down due to a sudden decrease in
conditions being 1427°C. This temperature is lower the area of the moving pipeline. After passing through
than the melting point of alloy steel, and it only this phase, due to the absence of a sudden decrease in
appears for a short time at the end of the compression volume, the speed of the gas flow began to increase
stroke and the beginning of the expansion stroke, and become more stable.
along with the fact that this amount of heat will be The speed of the gas flow after leaving the nozzle,
reduced due to heat exchange with the temperature of under normal working conditions, meets the initial
the newly fed gas, so the amount of heat in the calculated amount of gas. This suggests that the
company pushed throughout the operation is at a injection hose design has been adjusted to ensure
stable level. However, if this part expands due to too efficient gas distribution and a steady gas flow rate
much heat, it will greatly affect the volume of from the beginning to the end of the spraying process.
combustion gas in the nozzle, so finding a solution to 3.5. Spray needle layout diagram on the GX160
reduce the temperature of the propeller is a very engine
important task. When the engine is active, the piston moves from
The simulation results show that the nozzle the upper dead point to the lower dead point, and the
pushbar has a stable level of heat transfer and does elbow axis turns the smooth movement of the piston
not affect other parts of the nozzle assembly much. into the round motion of the bow axis. To determine
the speed of the engine, a permanent magnet bar is
3.4. Simulates the amount of gas moving through mounted on the outside of the elbow axis, and through
the nozzle during operation this, the Hall sensor will detect the speed and send
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The syngas gas supply pressure is 4 kg/cm this signal to the Arduino Mega 2560 microcontrol
(392,266 Pa), and the temperature of the air supply is circuit. As this signal requires high reliability, the
25°C. Because syngas is a synthetic gas from biomass anti-interference power circuit will eliminate the
processes and is not available in the flow study strange signals that send the signal back to the
modules of the simulation software, the team decided Arduino as accurately as possible. Based on the
to replace it with butane gas. The use of butane allows program that was initially programmed, Arduino will
process and determine the ignition time and the fuel
the team simulate and analyze the speed of the gas injection time, as well as control the openness of the
flow through the syringe under conditions similar to gas butterfly. This is crucial to the stable and efficient
those used with syngas. This ensures that the results operation of the internal combustion engine. The
obtained from the simulation accurately reflect the syngas gas fuel will be supplied to the injection hose
efficiency and functionality of the nozzle when at a pressure of about 4 kg/cm , along with the
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operating with syngas gas. The use of butane gas in integrated ignition cluster on the engine, all tasked
the simulation also helped the team to identify critical with receiving signals from Aduirno to inject the air
parameters such as air flow speed and pressure at as well as ignition to complete a combustion cycle in
different points in the nozzle, thus bringing the engine. The adjustment of the air flow into the
improvements and design optimizations to the highest combustion chamber will be decided by a servo
performance in real conditions. motor, and the control will be taken over by Arduino.

Figure 6. Spray needle layout diagram
on the Honda GX160 engine
(1) Arduino Mega 2560 microcontroller;
Figure 5. Simulation of Syngas velocity in the nozzle (2) Interference resistant power line; (3) Gas fuel;
(4) spraying pipes; (5) Servo motor; (6) Gas butterflies;
(7) Hall Sensor; (8) Eternal magnet
ISBN: 978-604-80-9779-0