1
$\begingroup$

RD0146 has been in the latest family of engines being developed from both Russia and US(Pratt and whitney). However, there is a lack of clarity in estabishing whether the expander cycle engine is open cycle(bleed) or closed. Can one determine it based on basic engine parameters?

http://www.russianspaceweb.com/rd0146.html

$\endgroup$
1
$\begingroup$

Main characteristics of the RD-0146 engine

The rocket engine is built according to the “gas-free scheme”: liquid hydrogen passing through the cooling jacket of the combustion chamber is gasified and used to drive a turbopump, and then in gaseous form enters the chamber, where it is burned with liquid oxygen

Ракетный двигатель построен по «безгазогенераторной схеме»: жидкий водород, проходящий через рубашку охлаждения камеры сгорания, газифицируется и используется для привода турбонасосного агрегата, а затем в газообразном виде поступает в камеру, где дожигается с жидким кислородом https://helpiks.org/1-122878.html

| improve this answer | |
$\endgroup$
  • 1
    $\begingroup$ My Russian isn't very good, but I'm pretty sure that «безгазогенераторной схеме» would be better translated as "gas generator free scheme". $\endgroup$ – Ilmari Karonen Sep 24 '19 at 14:49
1
$\begingroup$

It's a closed loop expander cycle. They published a fluid diagram:

https://arc.aiaa.org/doi/pdf/10.2514/6.2006-4904

And also explicitly state in the text:

After providing the required power to both turbopumps, the hydrogen gas is supplied through about 200 coaxial injectors into the combustion chamber.

| improve this answer | |
$\endgroup$
  • 1
    $\begingroup$ Can you include the diagram in your answer? The link you give is paywalled and what can be seen is insufficient to confirm what you say. $\endgroup$ – Organic Marble Sep 24 '19 at 14:36
  • $\begingroup$ Nope, it's not mine, I can't copy anything out of it. It's a scientific citation. You can go to a nearby library to look it up... or find other ways to get access to journal papers. $\endgroup$ – Rikki-Tikki-Tavi Sep 25 '19 at 0:12
  • 1
    $\begingroup$ Is the RD-0146 Flow Diagram from this page any good? $\endgroup$ – JCRM Sep 25 '19 at 14:07
  • $\begingroup$ @JCRM It's the exact same diagram. It's a vector graphic in the paper, but content-wise, it's the same. I assume that website copied it out of the paper. $\endgroup$ – Rikki-Tikki-Tavi Sep 26 '19 at 16:11
  • $\begingroup$ @OrganicMarble I added a quote from the text that also explicitly states it's a closed expander cycle. $\endgroup$ – Rikki-Tikki-Tavi Sep 26 '19 at 16:18

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.