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Post by azwood on Mar 7, 2018 21:28:33 GMT -5
Been fabricating turbo systems for bike and cars a long time but thease jets are really something new
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Post by racket on Mar 7, 2018 21:40:48 GMT -5
LOL..........think of a bike/car lube system ,......... engine spins pump irrespective of oil temp/pressure/flow , the relief valve takes care of the variables ...........I know it'll use more battery power when the oil is cold and flow lower , but if correctly setup with regards peak flow capacity vs pressure required , most of the running will be done with little extra battery usage.
Yep , theres a bit of difference between gas turbines using a turbo and an IC engine using one , thankfully our fueling control can be very crude by comparison , its more like a steam boilers than an automotive one .
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Post by azwood on Mar 7, 2018 23:51:15 GMT -5
Anyone else had dramas opening the jetspecs 2.0 download on a season phone🤔
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Post by azwood on Mar 7, 2018 23:55:16 GMT -5
LOL..........think of a bike/car lube system ,......... engine spins pump irrespective of oil temp/pressure/flow , the relief valve takes care of the variables ...........I know it'll use more battery power when the oil is cold and flow lower , but if correctly setup with regards peak flow capacity vs pressure required , most of the running will be done with little extra battery usage. Yep , theres a bit of difference between gas turbines using a turbo and an IC engine using one , thankfully our fueling control can be very crude by comparison , its more like a steam boilers than an automotive one . Thanks I guess my turbochareing background helps but I still have a lot to lern about jets.been following anders new build such great work he's doing hope to do something like that one day but I'll start basic. |
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Post by racket on Mar 8, 2018 3:31:18 GMT -5
Yep , there are differences between turbocharging and gas turbines , the biggest one is the turbine stage operation , in an automotive scenario its possible to force the hot exhaust through an "undersized" turbine stage by increasing the pressure upstream of the turbine to a greater pressure than the boost pressure, but with a gas turbine the turbine stage "voluntarily swallows" what it can at the pressure coming from the compressor stage , actually its a bit less due to losses across the flametube . Thats why those hybrid turbos with an oversized comp wheel make very poor gas turbines , in a lot of cases they simply won't work due to the comp going into surge , even the average petrol engine turbo isn't a good choice as they invariable need/have a wastegate , the turbos are setup for least turbo lag ,if the turbo does work as a gas turbine the power is below optimum because the comp will be flowing in a low flow region of its map at poor efficiency , a diesel engine turbo generally has an adequately sized turb stage because the engine manufacturer is concerned with fuel efficiency not max acceleration to boost conditions , also the engine operates over a narrower flow range so the comp can be designed accordingly , much more like a gas turbine scenario. I have all the usual turbo books , they're handy for reference , but still can't provide all the info for us . If one day you want to go down the full engine build like Anders and I , then it might be worth also keeping an eye on Andy M's new engine build jetandturbineowners.proboards.com/thread/1025/hx-102-255-money-pit I've been doing more thinking about the 110 mm inducered comp wheel and its high pressure potential after re examining the various blade "angles". Cheers John |
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Post by azwood on Mar 8, 2018 4:10:44 GMT -5
Just looking at buying the oil pump what would you guys recommend something like a brass gear type?
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Post by azwood on Mar 8, 2018 4:15:10 GMT -5
Yep , there are differences between turbocharging and gas turbines , the biggest one is the turbine stage operation , in an automotive scenario its possible to force the hot exhaust through an "undersized" turbine stage by increasing the pressure upstream of the turbine to a greater pressure than the boost pressure, but with a gas turbine the turbine stage "voluntarily swallows" what it can at the pressure coming from the compressor stage , actually its a bit less due to losses across the flametube . Thats why those hybrid turbos with an oversized comp wheel make very poor gas turbines , in a lot of cases they simply won't work due to the comp going into surge , even the average petrol engine turbo isn't a good choice as they invariable need/have a wastegate , the turbos are setup for least turbo lag ,if the turbo does work as a gas turbine the power is below optimum because the comp will be flowing in a low flow region of its map at poor efficiency , a diesel engine turbo generally has an adequately sized turb stage because the engine manufacturer is concerned with fuel efficiency not max acceleration to boost conditions , also the engine operates over a narrower flow range so the comp can be designed accordingly , much more like a gas turbine scenario. I have all the usual turbo books , they're handy for reference , but still can't provide all the info for us . If one day you want to go down the full engine build like Anders and I , then it might be worth also keeping an eye on Andy M's new engine build jetandturbineowners.proboards.com/thread/1025/hx-102-255-money-pit I've been doing more thinking about the 110 mm inducered comp wheel and its high pressure potential after re examining the various blade "angles". Cheers John Thanks again.yeah read corky bells books a lot over the years I'll look at jet books.i get the diesel turbo thing completely |
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Post by pitciblackscotland on Mar 8, 2018 4:33:12 GMT -5
G'day Mr azwood,
Yeah a gear type oil pump should work,or you could try using a subaru oil pump like John has done or maybe a VW oil pump but you will need to make up a adapter block for these oil pumps. I see you live in the yarra valley area not far from me. You are welcome to come over sometime and have a look at some of my turbine projects like the jet mower may give some ideas.
Cheers,
Mark.
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Post by azwood on Mar 8, 2018 4:38:40 GMT -5
G'day Mr azwood, Yeah a gear type oil pump should work,or you could try using a subaru oil pump like John has done or maybe a VW oil pump but you will need to make up a adapter block for these oil pumps. I see you live in the yarra valley area not far from me. You are welcome to come over sometime and have a look at some of my turbine projects like the jet mower may give some ideas. Cheers, Mark. Thanks for the info.great anouther jet guy near by.i might cum have a look it would help me understand them.what part of the valley are you in I'm near gladisdale. |
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Post by pitciblackscotland on Mar 8, 2018 4:51:44 GMT -5
Croydon North.
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Post by azwood on Mar 8, 2018 4:52:53 GMT -5
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Post by pitciblackscotland on Mar 8, 2018 4:59:26 GMT -5
I'll send you a PM
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Post by azwood on Mar 8, 2018 5:00:04 GMT -5
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Post by azwood on Mar 9, 2018 2:13:51 GMT -5
Hey mate would rally liked to drop in today but work was full on but I'll defently drop round soon looks like you have some great projects verry interesting stuff
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Post by pitciblackscotland on Mar 9, 2018 2:29:33 GMT -5
Yeah no worries mate, I have Tues off as well.
Cheers,
Mark.
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