Here's some history ... The Brayton Ready Motor was first produced in 1872. The first version of the engine used lamp gas or naphtha in a vapor carburetor. The fuel vapor was sucked into the compressor, pressurized and stored in a reserve tank. A pilot flame was held in the expander cylinder as the fuel / air mixture was admitted into the expander it was ignited by the pilot flame. A screen prevented the flame from propagating back into the reserve tank. At times the screen would fail and an explosion of the fuel / air mixture inside the tank would occur. Brayton later remedied this problem in 1874 by injecting fuel into a burner just after the admission valve. The fuels used were light oils or kerosene. These days the Brayton cycle is associated with gas turbine engines even though it's inventor (George Bailey Brayton) only made piston engines... The engine has 4 cycles ... Intake, compression.expansion,and exhaust. In a normal 4 cycle this take place in 2 revolutions of the crankshaft, however the Brayton engine performs all 4 cycles in one revolution. The small cylinder functions as a compressor which performs the intake and compression stroke. The compressed air is stored in a receiver tank. The larger cylinder is the expander which performs the expansion and exhaust strokes. Compressed air is injected through a pilot lit burner where combustion takes place as the air is passing through the burner thus creating a larger volume of air. The hot / expanded air then performs work in the expansion cylinder. After the expansion stroke the exhaust valve opens and exhaust is pushed out by the piston. A pilot flame keeps the burner lit during the exhaust stroke. The engine can operate on various fuels such as gasoline, kerosene and Diesel fuel. Brayton engines of this type predate the Otto 4 stroke by about 4 years. Both Otto and Diesel studied the Brayton engines before developing their engine cycles. This Ready motor was purchased by Nikolaus Otto for study. The Brayton was the first engine to compress air and burn fuel inside the cylinder. Brayton engines are also the first internal combustion engines to be used for motive power. They were used to power boats, a rail car, and even the fist practical submarine was powered by a Brayton engine.
@johnlucas2037
7 жыл бұрын
I see that you changed the title of this from "Non compression engine" to "low compression engine" That's a step in the right direction but I think you still may not understand what the Brayton is all about... BTW some of Brayton's early engines were tested with compression pressure as high as 150 PSI.. Compared to the first Otto engines which had a compression pressure of about 35 PSI the Brayton operates at about 50 psi so it was in fact a higher compression engine. Also the Brayton has the same 4 cycles as the Otto. Intake, compression, expansion and exhaust... so not much different except the early Brayton has 2 cylinders / pistons so it completes all 4 cycles every revolution. In his later years Brayton would build his engines with a 2:1 cam allowing the piston to work as both the compressor and expander same as the Otto. The defining feature and significant difference of Brayton's engines is that unlike the Otto's is that no explosion takes place. Fuel is injected and burned as the expansion stroke happens. If this sounds like a Diesel engine then maybe you are catching on to the concept... the Brayton is the first constant pressure engine that burns fuel inside the cylinder. In 1884 George Brayton made an injection pump that gave a precise amount of fuel for each stroke. In 1887 he developed a spring loaded pressure injector that converted liquid fuel into a combustable mist. With this engine for the first time he could regulate the speed solely by varying the volume of fuel injected exactly how a modern Diesel works. In 1890 he built an air blast injection system which is what Diesel's first engines used. There was only 1 major difference between the Brayton and the first Diesel engine and that was the compression ratio / ignition system. Because Brayton used a lower compression ratio he relied on an ignitor to initiate the combustion. The first engines used a pilot flame while later versions used a glowing platinum fueled pilot. Brayton died in 1892 the same year Diesel announced his endeavor to build the most efficient engine the world had ever seen. After 5 years the first Diesel would run in 1897. Here's a nice link to some more history about Brayton and his engines. oldmachinepress.com/2016/12/05/brayton-ready-motor-hydrocarbon-engine/
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