Collimatrix Posted February 22, 2015 Report Share Posted February 22, 2015 Definitely a must-see. LostCosmonaut 1 Quote Link to comment Share on other sites More sharing options...
Priory_of_Sion Posted February 23, 2015 Report Share Posted February 23, 2015 I would imagine the Foxbat's engine works in effectively the same manner. According to wikipedia the Tumansky R-15 engine also has those pumps which makes it a "turboramjet". I like that word - turboramjet. Quote Link to comment Share on other sites More sharing options...
LostCosmonaut Posted February 23, 2015 Report Share Posted February 23, 2015 A low effort google search has been distressingly unable to to find blueprints of the R-15 online. However, it wouldn't surprise me if it did indeed operate that way, especially since the figures I've seen for the R-15s pressure ratio are hilariously low (4.5-4.75:1). Quote Link to comment Share on other sites More sharing options...
T___A Posted February 23, 2015 Report Share Posted February 23, 2015 How does the YJ93 differ from the J58? Quote Link to comment Share on other sites More sharing options...
Sturgeon Posted February 23, 2015 Report Share Posted February 23, 2015 How would the R-15 do the super-dooper shock cone thingie, though? Quote Link to comment Share on other sites More sharing options...
Priory_of_Sion Posted February 23, 2015 Report Share Posted February 23, 2015 How would the R-15 do the super-dooper shock cone thingie, though? Communisms Quote Link to comment Share on other sites More sharing options...
LostCosmonaut Posted February 23, 2015 Report Share Posted February 23, 2015 It probably does a cheap imitation using the inlet ramps. Quote Link to comment Share on other sites More sharing options...
Collimatrix Posted February 24, 2015 Author Report Share Posted February 24, 2015 How does the YJ93 differ from the J58? They're both single-spool turbojets of mid sixties vintage designed for sustained mach 3 cruise, but otherwise they're quite different. YJ93 was designed by General Electric, the One True Jet Turbine Designer, while J58 was designed by the heathens at Pratt and Whitney (but they get a pass because anything that is attached to the blackbird automatically is holy). YJ93 is, according to everything I have read, essentially an embiggened J79 (phantom's engine). The J79 was unusual in that it reverted to a single spool just after double spools had become popular. In order to have a high pressure ratio on a single spool, the J79 was the first jet engine to feature variable-incidence compressor stators. In a single spool engine there is a single, central shaft taking power from the turbine blades to the compressor blades. In a two-spool engine there are two concentric shafts; one that connects the high pressure portion of the turbine to the high pressure portion of the compressor (red in the diagram), and one that connects the two low pressure sections (green). The advantage of this design is that the two portions don't need to rotate at the same speed, so blade geometry and velocity can be better tailored and optimized. The disadvantage of this design is that you have goddamn concentric power shafts rotating at a billionty RPM, so the bearings had better be up to it. In a few twin-spool designs like F119, the two shafts rotate in opposite directions. There are a few airliner engines that are three spool, and additionally the engines in the tornado and the TU-160 are three spool designs as well. How would the R-15 do the super-dooper shock cone thingie, though? Same way an F-14 or F-15 or concorde does: The inlet has variable geometry elements, but they're planar instead of radially symmetrical. Different way to accomplish the same thing. Quote Link to comment Share on other sites More sharing options...
Sturgeon Posted February 24, 2015 Report Share Posted February 24, 2015 I see I have just betrayed my ignorance of inlet design. I will retire in shame, as is the custom of my people. Quote Link to comment Share on other sites More sharing options...
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