Chinese Marine Propulsion

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ACuriousPLAFan

Colonel
Registered Member
OppositeDay said:
Hechai manufactures both original Deutz-MWM TBD620 and their own CHD620 engines. My guess is the ToT agreement gives Hechai IP rights over any improved variants they develop from TBD620 if certain performance parameters are met. Very common practice.

Since the engine offered to Thailand is referred to as "CHD620" not "TBD620" that means it's one of Hechai's improved variants. At least it should have high pressure common rail injection. Maybe sequential turbo-charging as well, not sure. Hechai's webpage on CHD620/622 is completely blank, so no specs sheet. Technologically it's certainly more advanced than MTU396, which is an ancient design by now (MTU is promoting MTU 4000 for new submarines).

We know from official press release that the newest variant of the series, the 4MW class CHD622V20BCR, will be used on next generation Chinese unmanned underwater vehicles. But we have no information on whether any engine of the series has been used on manned submarines. But I see the move toward CHD620/622 series as inevitable. MTU396 is really getting dated now and there's no chance China will get the licenses for U83, the submarine variant in MTU 4000 series.
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Sorry for this late intrusion, but is there any plans for future Chinese subs (like the 039C or 041) to use the CHD620 engines as well? Or just the Thai S26T sub?
 
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PaTu

New Member
Registered Member
First photo from a post on Weibo, believed to be the submarine variant of HND’s CHD620 diesel engine designated the CHD620V16H6 passing certification. This variant of CHD620 is planned to be installed on Pakistan Navy’s Hangor Class (S20P) and Royal Thai Navy’s S26T class submarine currently under construction. The CHD620V16H6 will replaced the MTU16V396SE84 as the submarine’s main generator since Germary block the export of such engine to China.

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by78

by78

General
It looks like a new
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has been listed on the corporate page of CSIC Longjiang GH Gas Turbine Co.

53208180472_fab040a9b8_h.jpg

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BoraTas

BoraTas

Captain
Registered Member
by78 said:
It looks like a new
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has been listed on the corporate page of CSIC Longjiang GH Gas Turbine Co.

53208180472_fab040a9b8_h.jpg

53209055421_902fc20cfc_o.jpg
Click to expand...

40% efficiency at this power level is very respectable and is just another sign that gas turbine problem is stopping being a problem.

I want to ask something. Is it really for ships? The fuel is listed as natural gas and its airflow is 24% higher despite less than half the RPM compared to the new LM2500. That would mean a big turbine. Looks like an engine designed for long lifespan and reliability rather than power density.

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