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楼主: mettle

[技术] 美国密歇根州威廉姆斯研究所制造的WR24-7-2型发动机

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 楼主| 发表于 2018-1-5 21:23:32 | 显示全部楼层

WR24-7-2型发动机

WR24-7-2型发动机


WR24-7-2型发动机

WR24-7-2型发动机


WR24-7-2型发动机

WR24-7-2型发动机

 楼主| 发表于 2018-1-5 21:23:54 | 显示全部楼层

WR24-7-2型发动机

WR24-7-2型发动机


WR24-7-2型发动机

WR24-7-2型发动机

 楼主| 发表于 2018-1-5 21:24:44 | 显示全部楼层
The last photos show the electronic fuel control unit. Actually, that’s a spare one that suffered from some corrosion. The hardware appears to be a vintage 1975 electronic assembly and was quite advanced for that time. The unit basically consists of an electronic contol section, a proportional valve and a fuel shutoff valve. The control scheme is as simple as possible: The ECU is powered by a 24VDC supply and receives the engine the alternator frequncy (which is proportional to the engine RPM) as the only feedback signal. One trim-up and one trim-down signal are required to control the engine. But let’s first look at some obsolete high-quality electronics...

WR24-7-2型发动机

WR24-7-2型发动机


WR24-7-2型发动机

WR24-7-2型发动机


WR24-7-2型发动机

WR24-7-2型发动机

 楼主| 发表于 2018-1-5 21:25:02 | 显示全部楼层

WR24-7-2型发动机

WR24-7-2型发动机


WR24-7-2型发动机

WR24-7-2型发动机

 楼主| 发表于 2018-1-5 21:25:54 | 显示全部楼层
The whole electronic assembly consists of a stack of three PCBs and a manually wired power section behind. The individual PCBs and the power section are interconnected by a flexible capton printed circuit film.

WR24-7-2型发动机

WR24-7-2型发动机

The startup sequence is as follows: At the same time, the starting air and the ignition exciter are energized. When the engine exceeds 10,000 RPM, A “trim up” is signalled, causing it to launch the start sequence. The engine is slowly accelerated to idle RPM while the starting air source and the ignition exciter can be removed at around 40,000 RPM. Once 50.000 RPM idle has been reached, the engine can be controlled by signals to the trim up/down inputs.

WR24-7-2型发动机

WR24-7-2型发动机

The big round part is the proportional valve while the smaller part is the fuel shutoff valve.

WR24-7-2型发动机

WR24-7-2型发动机

This needle/piston assembly actually hydromechanically dampens the proportional valve. Moreover, the threaded insert permits adjustment of the minimum flow to prevent an engine flameout when throttling down quickly.

 楼主| 发表于 2018-1-5 21:26:48 | 显示全部楼层

WR24-7-2型发动机

WR24-7-2型发动机

The fuel shutoff valve. Should go anything wrong with the engine, (speed excursions), the ECU will stop the enigne by closing this valve.

WR24-7-2型发动机

WR24-7-2型发动机

The proportional valve actuator and the shutoff valve plunger seat.

WR24-7-2型发动机

WR24-7-2型发动机

 楼主| 发表于 2018-1-5 21:27:48 | 显示全部楼层
The fuel shutoff valve. Should go anything wrong with the engine, (speed excursions), the ECU will stop the enigne by closing this valve.

WR24-7-2型发动机

WR24-7-2型发动机

The proportional valve actuator and the shutoff valve plunger seat.

WR24-7-2型发动机

WR24-7-2型发动机


The mating surface of the proportional valve.
Meanwhile, a test stand for the engine has been welded, and I hope soon I can publish a video of a WR24-7-2 running...

 楼主| 发表于 2018-1-5 21:28:28 | 显示全部楼层
Early summer 2014: Well, this “soon” is something quite relative - these things always take much longer than anticipated. But finally, here you are:

WR24-7-2型发动机

WR24-7-2型发动机

The engine “professionally” clamped onto a support... ;-)

A fire extinguisher is something that I don’t joke about - during “firsts” like this, it has to be present.

WR24-7-2型发动机

WR24-7-2型发动机

Since I arranged the fuel system a little different compared to the manufacturer’s design (I used a pressure-limited pump instead of utilizing the fuel cell pressurizing port of the engine), we had some trouble getting the engine to ignite and accelerate. The starting air caused too much back pressure in the fuel intake system so the pump couldn’t provide enough flow. That’s why the engine rpm oscillated a little initially and then accelerated only up to approx. 36krpm (60%). Meanwhile, I changed the configuration as per the manufacturer’s specs and the engine accelerates flawlessly. Bot as yet, I haven’t got a video clip of that last configuration. Anyway, here’s what I’ve got. Enjoy!

发表于 2018-1-5 23:24:54 | 显示全部楼层
厉害了,会喷火吗
发表于 2018-1-29 12:57:35 | 显示全部楼层
这个好用吗??
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