scavenge

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(skăv'ənj) pronunciation

v., -enged, -eng·ing, -eng·es.

v.tr.
  1. To search through for salvageable material: scavenged the garbage cans for food scraps.
  2. To collect and remove refuse from: The streets are periodically scavenged.
  3. To collect (salvageable material) by searching.
    1. To expel (exhaust gases) from a cylinder of an internal-combustion engine.
    2. To expel exhaust gases from (such a cylinder).
  4. Metallurgy. To clean (molten metal) by chemically removing impurities.
v.intr.
  1. To search through refuse for useful material.
  2. To feed on dead or decaying matter.

[Back-formation from SCAVENGER.]


Of anesthetic. See anesthetic scavenging.

  See crossword solutions for the clue Scavenge.
Wikipedia on Answers.com:

Scavenging (automotive)

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Uniflow scavenging

In automotive usage, scavenging is the process of pushing exhausted gas-charge out of the cylinder and drawing in a fresh draught of air ready for the next cycle.

This process is essential in having a smooth-running internal combustion engine. Modifying the exhaust system, (i.e. modifying the exhaust gas velocity by changing exhaust tube diameters) can detract from the "ideal" scavenging effects, and reduce fuel efficiency and power if not properly planned out and executed.

To increase scavenging potential, the entire path from intake to exhaust (i.e. all powertrain parts) to tailpipe must be tuned in sync with each other. This will ensure that the air flow is never interrupted. The acceleration and deceleration of this exhaust gas is what will hinder the scavenging potential.

For example, fast flowing heads and a tunnel ram intake combined with a poorly planned camshaft and exhaust system will cause the air to "slow down" and "speed up" throughout its journey, thus reducing its scavenging potential. So, to increase scavenging potential, the air must maintain a positive linear acceleration curve.

There are three types of scavenging on the basis of the flow of air:

  1. Direct or cross scavenging
  2. Loop scavenging, using Schnuerle porting
  3. Uniflow scavenging
Contents

Cross flow scavenging

In this method, the transfer port (or inlet port for the engine cylinder) and exhaust port are situated on the opposite sides of the engine cylinder (as was done in case of two-stroke cycle engines). The piston crown is shaped as a deflector piston, so that the fresh charge was intended to move upwards and push out the burnt gases in the form of cross flow. as shown in (a)

Types of scavenging

Backflow or loop scavenging

In this method, the inlet and outlet ports are situated on the same side of the engine cylinder. The fresh charge, while entering into the engine cylinder, forms a loop and pushes out the burnt gases. as shown in (b)

Uniflow scavenging

In this method, the fresh charge, while entering from one side (or sometimes two sides) of the engine cylinder pushes out the gases through the exit valve situated on the top of the cylinder. In uniflow scavenging, both the fresh charge and burnt gases move in the same upward direction. as shown in (c)


See also


Translations:

Scavenge

Top

Dansk (Danish)
v. tr. - rense, skylle
v. intr. - rode i affald

Nederlands (Dutch)
afval doorzoeken, aas eten, afval

Français (French)
v. tr. - (lit) récupérer, (fig) mendier
v. intr. - faire/fouiller les poubelles

Deutsch (German)
v. - durchstöbern, reinigen, sich von Aas ernähren

Ελληνική (Greek)
v. - ανακυκλώνω απορρίμματα, τρέφομαι με θνησιμαία
n. - ανακύκλωση

Italiano (Italian)
spazzare, scovare, cercare tra i rifiuti, ricerca

Português (Portuguese)
v. - varrer

Русский (Russian)
убирать мусор, чистить, рыться в отбросах, работать мусорщиком, питаться падалью или отбросами, использовать отбросы производства

Español (Spanish)
v. tr. - limpiar, barrer (calles), recoger (la basura)
v. intr. - hacer de basurero, de barrendero, (mec) expulsarse de gases quemados

Svenska (Swedish)
v. - rengöra, spola, sopa, rensa, hålla rent, rota i avfall
n. - rengöring, spolning, sopning

中文(简体)(Chinese (Simplified))
搜寻有用之物, 清除污物

中文(繁體)(Chinese (Traditional))
v. tr. - 搜尋有用之物
v. intr. - 清除汙物

한국어 (Korean)
v. tr. - 청소하다, (내연 기관의 기통에서) 소기하다
v. intr. - 청소부로 일하다, 화학적으로 제거하다

日本語 (Japanese)
v. - 掃除する, あさる, ごみの中からあさる

العربيه (Arabic)
‏(فعل) يبحث عن طعام, يكنس, ينظف (الاسم) تنظيف, كنس‏

עברית (Hebrew)
v. tr. - ‮סילק מוצרים לא-רצויים ממנוע בעירה פנימית‬
v. intr. - ‮חיטט באשפה, חיפש מזון, ניקה רחובות, ניזון מפגרים (חיה או עוף)‬


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