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Analytical principles and practical application of the expansive steam engine; as employed in pumping, manufacturing, steam navigation, railway locomotion, &c - Softcover
Synopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1849 Excerpt: ...(G) And the same equation may be expressed in a specific form as follows: horse's power = 0.7854 x diameter x mean pressure x velocity-=-33000. (G) r This is the form which the equation assumes, when the steam is admitted from the boiler throughout the whole length of the stroke, and the practical rule which it supplies may be expressed in words at length, as follows: Rule.--Multiply the area of the piston in square inches, by the pressure of the steam in pounds per square inch, and again by the velocity of the piston in feet per minute; then divide the product by the constant number 33000 for the power of the engine. This rule is alike applicable to every kind of steam engine when the mean effective pressure of the steam is known; but, since that requires to be computed in the case of an engine working by expansion, it becomes necessary so to modify the above equation, as to involve the process for finding the mean pressure which is due to the entire effect of the steam; this process we have represented in equation (B), and when that value of p is substituted in the general equation above, we get, h=0.1854(FPv (hyp. log. n + l)-f-33000 n.. (H) This expression exhibits the whole of the steps that must be performed to determine the power of the engine, on the supposition that the values of all the letters which it involves are known, with the exception of the letter h, which indicates the number of horses that are equivalent to the power of the. engine. The form which the equation here assumes is a little complicated, and may perhaps offer some difficulty to practical men in general; it is nevertheless sufficiently simple as an instrument of calculation, and since we have elsewhere shown how to obtain the mean pressure due to the whole effect of the steam, t...
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- PublisherRareBooksClub.com
- Publication date2012
- ISBN 10 1130327744
- ISBN 13 9781130327748
- BindingPaperback
- LanguageEnglish
- Number of pages68
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