E-CodeImpeller velocity triangles (Euler head) — a TI-84 Plus CE program
TURBOM is a TI-BASIC program for the TI-84 Plus CE. Pump impeller exit triangle from speed, radius, width, blade angle and flow: Euler head, hydraulic power and dimensional specific speed.
What it asks for and what it shows
It asks for 5 values at its prompts. In the example below it shows U2 M/S, CM2 M/S, CU2 M/S, H EULER, P KW, NS.
Example run
One of its oracle test cases: “backward-curved impeller”. The inputs are typed in order, and the results are the values the case expects on the screen.
| Step | Value |
|---|---|
| You enter | |
| Input 1 | 1450 |
| Input 2 | 0.15 |
| Input 3 | 0.02 |
| Input 4 | 25 |
| Input 5 | 40 |
| The screen shows | |
U2 M/S= | 22.77654674 |
CM2 M/S= | 2.122065908 |
CU2 M/S= | 18.22576171 |
H EULER= | 42.31599526 |
P KW= | 16.60479654 |
NS= | 17.47912057 |
How it's checked
4 test cases, each checked against the textbook formula it uses. Replayed key by key on a virtual TI-84 Plus CE, they make 27 checks.
How E-Code checks every program
Run it or put it on your calculator
- Open the library in the TI-84 Plus CE calculator and pick “Impeller velocity triangles (Euler head)” (TURBOM).
- Put it on your own calculator with a computer and a USB cable, or type it in by hand.
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All TI-84 Plus CE engineering programs · All TI-84 Plus CE programs