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HỘI THẢO QUỐC TẾ ATiGB LẦN THỨ CHÍN - The 9 ATiGB 2024 185

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principle, which offers many advantages over Maximum pressure Pmax is 23 bars (23.453 kg/cm )
traditional nozzles. [4].
Operating principle of the syngas injection hose Because the valve receives pressure in the form of
on the Honda GX160 engine: pressure, the greater the exposure space, the larger the
The sprayer operates on the principle of larger the pressure of action on that detail, so the
electromagnetic touch. The syngas gas injection pipe surface exposure is a necessary parameter when
is supplied with syngasa gas fuel from the syngase calculating:
gas tank, and syngases will be conducted through the 2 2
gas pipeline to the gas connector and put into the S = D − d (15)
inside of the spray pipe. When there is a fuel injector In there: D is the large diameter outside the
signal from the microprocessor circuit, a current will injector; d is the small diameter inside the nozzle. So
be supplied into the wrapping roll around the iron we need to test the tolerable pressure of the nozzle.
core inside the spray. When the current passes The Poisson coefficient of C45 alloy steel ranges
through the coil, it generates a magnetic field that from 0.27 to 0.30. We have: the compressive strength
sucks the magnetic torque and pushes the torque of the alloy steel C45 is 400 MPa, equivalent to the
down through it, which opens the nozzle pushbar and compressive ultimate limit that this alloy can
the syngas through which it enters the combustion withstand of 4x10 N/m .
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chamber of the engine. When a signal ends the syngas
injection process, the microprocessor circuit will Based on the durability pressure test (Figure 2a),
disconnect the current inside the coil, the magnetic we find that the highest pressure area is the cutting
field will disappear, and the torque will be returned to surface in direct contact with the flame gas. The
its original position and prepared for the next maximum pressure that the valve base receives under
2
injections. operating conditions is Pmax = 2.908 x 106 (N/m ).
This pressure matches the durability limit of C45
alloy steel, ensuring the durability of the valve base
during operation. The pressure of direct action on the
valve seat decreases gradually from the area of direct
contact with the ignition gas to the head of the body
nozzle.
Thermal resistance test method of the injection
valve base:
The head of the valve base nozzle comes into
direct contact with and receives heat from the
combustible gas, necessitating heat transfer
simulation to ensure operational efficiency under
extreme temperature conditions. The maximum
temperature received by the valve base nozzle is:
Tmax = 1700 K = 1426.85 C [4] (16)
o
The operating temperature in detail depends
heavily on the area of exposure, so this parameter is
important. The surface area of the syringe exposed to
pressure during combustion is:

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Figure 1. Details of the reverse-opened nozzle S = D 2 − d (17)
(Length: 105mm, Maximum diameter: 32mm)
In there: D is the large diameter outside the valve
Nozzle pushbar, (2) valve base, (3) pressure spring, base, and d is the small diameter inside the valve
(4) magnetic absorber, (5) valve body, (6) centering base. The heat transfer coefficient of C45 alloy steel
bolt, (7) coil, (8) coil cover, (9) cover cover, is 46,5.
(10) cover cover ring, (11) air pipe
The lower part of the valve base is installed
3.2. Testing directly into the combustion chamber; the upper part
3.2.1. The valve base is exposed to outside air, so there is a heat exchange.
So the team simulated the environmental temperature
The part directly exposed to the gas pressure of at 27 C.
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the injection hose is the first side of the valve base.
ISBN: 978-604-80-9779-0