Electric pump power requirement

Electric pump power requirement

I am designing an electric methane pump, using CF turbo, an automated pump design software. I set up two configurations, one with a single centrifugal impeller, and one with a centrifugal impeller+inducer. The setpoint of both is the same, but somehow the single stage version has 42 kw required driving power, with 52% efficiency, while the dual stage version has 40 kw power requirement with 19.7% efficiency. How is this possible? Shouldn’t the more efficient pump have a lower shaft power requirement?

u/fiwic42533 — 5 days ago
▲ 8 r/Motors

30-50 kw electric motor

I am looking for a relatively small, high performance brushless DC electric motor that can output in the range of 40-50 kw at 35,000 rpm for an electric pump I’m working on. Very similar to the ones used on the Rocketlab Rutherford engine. Is this even something I could buy?

This is the best one I could find, but the power would be slightly lower than I need at the required rpm, and I would rather not design a complex gearbox if I don’t have to

https://www.lehner-shop.com/en/inrunner/series-30/30100

Edit: I have a BS and MS in aerospace engineering, and have developed and successfully tested 2000 lbf liquid rocket engines. I know what I’m doing and am not in danger

reddit.com
u/fiwic42533 — 11 days ago

30-50 kw electric motor

I am looking for a high performance brushless DC electric motor that can output in the range of 30-50 kw for an electric Lox pump I’m working on. Very similar to the ones used on the Rocketlab Rutherford engine. I know a lot about rocket engines but not electric motors. Is this even something I could buy? The only one I could find in that range weighed 50 kg.

reddit.com
u/fiwic42533 — 12 days ago

I (23M) am struggling with not having felt infatuation for my gf (F22)

We have been dating for ~6 months, and it’s both of our first relationships. Before dating, we were acquaintances, and although found each other attractive, did not particularly have crushes on each other. Eventually, I felt I was developing feelings for her, so I asked her out. I realized I liked her when I would put more effort into my appearance and how I dressed when I knew I was going to see her, and would always feel nervous when talking to her. Our relationship has been great since then. We get along great, I trust her, am attracted to her. We share a lot of common interests, she has an amazing attitude for life, strong family values, knows how to have fun but is very classy at the same time. We spend almost every day together, and I definitely enjoy her company and making her happy. We have both said we love each other. We haven’t had sex because she’s a virgin and still not ready.

I can obviously tell I care about her romantically because I think about her all the time, enjoy time we spend in the bedroom, get jealous sometimes, etc. That being said, I haven’t felt an extreme infatuation at any point in our relationship, and I’m concerned that that’s not normal. Mostly because I don’t know what love and a relationship should feel like because it’s my first one.

A bit of background about me:

In lower school and middle school I was severely infatuated with someone for probably 6 years (ik not super healthy). In high school I was infatuated with a girl for a year maybe, but said no when I asked her out. 6 years later, I haven’t felt infatuation since. I haven’t felt super strong positive romantic feelings at all really, even when I lost my virginity which I always figured would be a bigger deal for me. Only minor crushes. I have been on maybe 10 dates before dating my gf, and always ended it because I didn’t feel much or always found something wrong with them. I never ended things with my current gf though because on paper she is exactly the kind of person I’m looking for and we get along really well. Although I really like spending time with her and feel we have built a strong relationship, I’m worried skipping the infatuation stage is an issue, and implies she’s not the one.

Is my understanding of love and relationships just undeveloped due to lack of experience? Or is there an actual problem? Are my issues potentially just caused by relationship OCD which would be resolved by talking to a therapist?

reddit.com
u/fiwic42533 — 19 days ago