Topic
Muffler
About: Muffler is a research topic. Over the lifetime, 8209 publications have been published within this topic receiving 42664 citations.
Papers published on a yearly basis
1 / 3
Papers
1 Jan 2007
TL;DR: In this paper, a prototype automobile exhaust thermoelectric generator (AETEG) installed in a 1999 GMC Sierra pick-up truck was tested in a dynamometer-equipped wind tunnel at Delphi Corporation's Harrison Thermal Systems Division in Lockport, New York.
Abstract: Testing was conducted on a prototype automobile exhaust thermoelectric generator (AETEG) installed in a 1999 GMC Sierra pick-up truck. The system consisted of the generator, its power conditioning unit, and the interfaces to the test truck's engine coolant and exhaust systems. The objective of the test was to measure the AETEG's performance and its effect on the truck systems as well as to determine which factors are important for optimizing an AETEG design. Testing was performed in a dynamometer-equipped wind tunnel at Delphi Corporation's Harrison Thermal Systems Division in Lockport, New York. The first tests established the benchmark data set. Then the prototype AETEG was installed and three configurations of the system were tested in succession: the AETEG alone, the AETEG with portions of the exhaust pipes leading to it insulated, and the AETEG with insulated upstream exhaust pipes and with a pre-cooling heat exchanger operating to lower the inlet coolant temperature to the generator. Some of the important outcomes of the tests were: insulating the exhaust and lowering the coolant temperature had a significant positive effect on the power, parasitic losses resulting from the AETEG weight and the coolant pumping power were significant but manageable, and the increased exhaust flow resistance and the additional heat load from the AETEG were not significant effects.
195 citations
TL;DR: In this paper, a simple method is presented for modeling perforated muffler components, such as concentric resonators and expansion chambers, with one acoustically long dimension, using a segmentation procedure in which each segment is described by a transmission matrix.
Abstract: A simple method is presented for modeling perforated muffler components such as concentric resonators with perforated flow tube, and expansion chambers and reverse flow chambers with perforated inlet and outlet tubes. The theory includes mean flow, but is confined to those configurations having one acoustically long dimension. It is based on a segmentation procedure in which each segment is described by a transmission matrix. The four‐pole parameters of a component are then found from the product of the transmission matrices. The four‐pole parameters for configurations having through flow, cross flow, and reverse flow are presented. Because the product matrices are dimensionally small and because no inversion is needed, computational time is much lower than other methods such as finite element or finite difference. This allows rapid and economical modeling to be performed where iterative solutions are required because of dominating finite amplitude effects, for example.
164 citations
TL;DR: In this article, the transfer matrix method was used for the one-dimensional acoustic analysis of engine exhaust muffler and the absorption coefficient was estimated from the overall transfer matrix obtained by multiplying unit transfer matrices for perforated panels or airspaces.
161 citations
Patent•
15 Oct 1992TL;DR: In this article, a lean NOx reduction catalyst capable of reducing NOx through reaction of H 2 with NOx at low temperatures below 350°C is installed in a downstream portion of an exhaust pipe of an internal combustion engine in or near a muffler.
Abstract: A lean NOx reduction catalyst capable of reducing NOx through reaction of H 2 with NOx at low temperatures below 350° C. is installed in a downstream portion of an exhaust pipe of an internal combustion engine in or near a muffler. Such an NOx reduction catalyst comprises, for example, Pt/zeolite catalyst. An H 2 generator is installed so as to supply the H 2 to an inlet side of the NOx reduction catalyst. The H 2 generator may include a reforming catalyst for reforming methanol, LPG, or natural gas to generate H 2 . The generated H 2 flows to the NOx reduction catalyst where it reacts with NOx to purify the exhaust gas.
160 citations
Patent•
16 Jun 2006TL;DR: In this paper, an organic Rankine cycle (ORC) was used to extract heat from engine intake air, coolant, oil, EGR and exhaust, which was controlled by bypass valves (92, 94, 96, 99) or a mass flow control valve (113).
Abstract: The shaft (20) of an engine (19) is coupled to a turbine (28) of an organic Rankine cycle subsystem which extracts heat (45-48, 25) from engine intake air, coolant, oil, EGR and exhaust. Bypass valves (92, 94, 96, 99) control engine temperatures. Turbine pressure drop is controlled via a bypass valve (82) or a mass flow control valve (113). A refrigeration subsystem having a compressor (107) coupled to the engine shaft uses its evaporator (45a) to cool engine intake air. The ORC evaporator (25a) may comprise a muffler including pressure pulse reducing fins (121, 122), some of which have NOx and/or particulate reducing catalysts thereon.
142 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2025 | 17 |
| 2024 | 45 |
| 2023 | 61 |
| 2022 | 82 |
| 2021 | 63 |
| 2020 | 112 |